Shaman vs priest healing

So, my shaman Larue dinged 70 recently and have been trying out the Resto way for a little while. I have been healing mostly on my priest and a little dabbling on the side in the druid way of healing while still specced feral. In short, I have healed very little on my shaman, and while there are many similarities to the priestly way of doing it, there are also differences and it takes some getting used to.

A brief spell comparison
(Casts times with talents, mana costs without talents, healing amount without heal bonuses, spells or effects from set bonuses, trinkets and similar not included)

Slow large heal
Priests have Greater Heal, 2,5 secs cast, 825 mana, heals for about 2550, while shamans have a similar ability, Healing Wave, 2.5 secs cast, 720 mana, heals for about 2300.

Faster smaller heal
Flash Heal for priests, 1.5 secs cast, 470 mana, heals for about 1200. Lesser Healing Wave for shamans, 1.5 secs cast, 440 mana, heals for about 1100, so not much difference here either.

HoTs
Priests have Renew, instant cast, 450 mana, ticks for 222 heals every 3 seconds (about 255 with Improved Renew)

A draenei shaman has the racial ability Gift of the Naaru, which has a 1.5 secs cast, costs no mana and heals for (your level * 15 + 35) damage in total over 15 secs, which for a level 70 character means 217 heal every 3 seconds. This spell has a 3 min cd, which makes it marginally useful unless you have some way of remembering that its cd is up and its available for use.

Shamans also have Healing Stream totems, which can be considered a form of HoT as long as the group members stay in range of it (within 30 yards if the shaman has the talent Totemic Mastery). The Healing Stream costs 90 mana to pop and heals 18 damage (23 with Restorative Totems) every 2 seconds for 2 minutes. (Its not as low as it seems, Larue's current heal bonus of 931 makes this totem heal 81 damage every 2 seconds.)However, this totem can't be used at the same time as Mana Spring totem though, they both use the water totem.

Group heals
Priests have Prayer of Healing and (if specced for it) Circle of Healing. PoH has a cast time of 2.5 secs, heals group members within 30 yards of the priest for about 1000 and costs 1070 mana. CoH is instant, heals the target and group members within 15 yards of her (not the casting priest) for about 430 and costs 450 mana.

Shamans have Chain Heal, their white lazer beam heal with a 2.5 secs cast that heals up to three targets for about 900, 450 and 225 respectively (1080, 540 and 275 with Improved Chain heal) for a cost of 540 mana.

On-damage heals
Priests have Prayer of Mending, an instant spell that for 390 mana throws a frisbee to her target. When the target takes damage the frisbee heals her for 800 damage and then jumps to another group member within 20 yards.

Shamans place an instant cast Earth Shield on their target. The shield is instant cast, costs 450 mana and stays on the target with 6 charges that heals for 270 every time the target gets hit.

Oh-shit heals
When that oh-shit moment turns up, a priest pops a Power Word: Shield on the target, quickly followed by a Flash Heal or if time permits, a Greater Heal.

When a shaman needs an emergency heal, she pops Nature's Blessing, followed by presumably a Healing Wave.

Aggro dumps
A priest has Fade, which drops her aggro level for 10 seconds, and by the time Fade fades, someone else usually has worked up enough aggro to keep the mob from going for the priest again.

A shaman has a Tranquil Air totem that she can pop. However, since this affects the entire group within range (30 yards if you have the talent Totemic Mastery) it's usefulness is very limited.

Luckily, since a shaman can wear mail she usually can take a little beating before she goes down, which hopefully gives the tank or other enough time to re-establish aggro. (As a comparison, my freshly dinged shaman in greens and blues has 7200 armor whilme my epicced-out priest has 1500).

Mana preservation and regeneration
Mana regeneration for both priests and shamans at lvl 70 are calculated in the same way. Priests have a talent, Meditation, that allows 30% of this mana regeneration to keep going while they cast. Shamans have a somewhat similar talent, Unrelenting Storm, but this is deep in the Elemental tree and out of reach for a Resto shaman.

Priests have the talent Inner Focus that gives you a free spell cast every three minutes, and also a talent Holy Concentration that may give you another freebie.

A talent in the Discipline tree, Divine Spirit, also gives a buff that improves the priest's Spirit-based mana regeneration, and the Improved version also increases the healing bonus. (This talent requires at least 21 points (23 for the Improved version) so if you choose this one you can't have the Circle of Healing from the Holy tree)

Priests also have a Shadowfiend, a pet on a 5 minute cooldown that gives the priest mana back when the pet deals damage.

Shamans have no talents for mana-free spellcasts but they have a Mana Spring totem, that for a measly 120 mana pops a totem that with Restorative Totems will replenish 2800 mana for the 2 minutes its up.

Resto shamans also get the Mana Tide totem, which has a 5 minute cd like the Shadowfiend and gives mana back to all group members withing range.

Cleansing
Priests can Cure Disease and Abolish Disease (for those nasty mobs that keep contaminating people), they can Dispel Magic and Mass Dispel (extra powahful area dispell)

Shamans can Cure Disease and pop a Disease Cleansing Totem when hanging around unwashed mobs crawling with germs. They can also Purge mobs, but can't dispel magic effects from friends. They can however Cure Poison and use Poison Cleansing Totems.

Fun-ness
I have been healing on my priest for so long now I can probably do it in my sleep (but don't tell my fellow raiders I do this! ;P) and I still enjoy it. There are certainly still things to learn and ways to improve, but overall I am pretty happy with my priest at the moment. I will not bring her to Karazhan anymore because that probably would make me fall asleep, although she still could use some of the drops in there I have been there too many times to find it even remotely fun on my priest. I save the ZA and 25-man runs for Jools, that is where I enjoy playing her the most.

Shaman healins is not yet as instinctive but it's novel and fresh and although there are many similarities it is different enough to be interesting, and I am really looking forward to honing her skills and abilities in normal and heroic 5-mans and it would be great fun to take her to Karazhan.