I Love my resto. She's awesome in a melee team, as she can throw Earth Shield on the tank and roll Riptides on the DPS. Between that and healing stream, I have very little to worry about when it comes to random AOE on the DPS. If I need more AOE healing, I can hit chain heal, which is glyphed to 4 targets.

Really, the only lacking healer out there, IMO, is the holy paladin. Any other healer has plenty of tools to take care of AOE.