The Dispeller
This person realizes that healing is not about topping your allies. He will keep an eye on dispellable CC effects like sheep, fear and paladin stuns. Will watch out for Unstable Affliction. Occasionally he throws out a CC himself. When idle, and safe from enemy interrupts, he will start healing. Often a dedicated specced healer class, but occasionally a shadow priest with 2 functioning brain halves. He'll guide your team into victory, and makes sure a flag carrier reaches its destination. Likely to buff up his allies when ressing at a graveyard.