Honestly I think healers are too powerful in general right now, at least in PvP. Best way to nerf them would probably be to lower the stats on their PvP gear, either intellect or resil. Some classes just simply cannot kill an average to good healer on their own, at least compared to some classes like rogues, warriors and death knights which can kill a healer with relative ease.
I personally play ret/feral in 2's and we are decent (1650) We're fairly good at chain ccing healers or their dps depending on who we want to hit, but a healer paired with a good peeling class is an absolute pain to kill because our time on target is so low. I would really love to see multi dps comps be more viable. Winning by making the other team's healer oom is not interesting gameplay imo.
also inb4 "lols pvp isn't based on 1v1"