I am sprinting to 80 on my little shaman, having made 77 last night and she is a ton of fun to play but admittedly, I solo almost exclusively in elemental. Mind you, I'm rolling with garbage quest gear and heirloom weapon/shoulders.
I have healed some 5 mans....too long a wait as a DPS, and I have found healing challenging as a shaman, mostly mana management. Poor gear, I suppose. (yes, I am dual specced ele/resto) I healed most of BC as a resto druid so I have healing experience.
The point I want to make concerns last night when I dinged 77 and had the final 'Ursoc' quest left to complete in Grizzly Hills. Its a 3 player group quest and I solo'd it but it took me 3 tried. You get an NPC to take a role and I asked him to tank. I tried it as resto, launching my fire elemental and just healing the snot out of the bear tank NPC. I went OOM super fast and eventually lost the tank and died. I tried again with the same result. I tried a 3rd time as elemental and got it done. Mana was much less a problem as I kept Flame Shock up, hit a Lava Burst and cast heals on the Clearcasting while contributing damage to the boss.
And this has been my experience coming up. My gear bites, true, but in Elemental, especially now with the FS/LB crit mechanics + Clearcasting, I'm never out of mana. Yet, as full resto, I'm generally sucking fumes. When healing, I'm always getting paired up with weak tanks that are DPS desperately trying to get instance runs by BSing their way into dungeonsm as tanks.
Druid healing is far different what with rolling HoTs and what not and I guess holy pally would be the true polar opposite but shaman healing is still much different. Boring? Perhaps at lvl 80 with better gear and a competent tank. I can see that. In raids? I really couldn't say although I really like this character and I intend to keep playing her quite a bit. I'm really not satisfied with my tree healing. Its multi dimensional and I don't feel proficient with it unless I am immersed in it...I can't pick it up occasionally and be as good as I want to...and that's sorta the problem with having multiple alts.
Shaman healing is pretty stright forward. /shrug
your hat may be nice, but I have the little white tank top that says Legendary right across my boobs. I win. (or more correctly, H wins)