Yeah, we had a Pally healing the healers (me, then I get some treedrood help) on Karathress after the Shaman went down (we do Shaman->Hunter->Priest) and he did great... I just took like 10k dmg in three-four seconds, and neither of us had a chance to react.
I have to say though, I really enjoy healing that fight as a priest. Totem kiting is kinda fun.
