Not 80 or AA'd yet, but I am feeling pretty ineffective as a healer in random world PvP 1v1 and 2v# when I am playing with a friend. Blue and green HoTs rolling don't come near covering incoming damage, and the once per minute heal is about equivalent to a single combo.
Other games, healing felt clutch and vital. Here it seems like the priority should just be on pushing damage. It seems like most players feel the same, since priests are by far the least played class, and of the priests, the most popular is the DPS PoM.