Healers aren't as helpless as they may have been in the past, A holy paladin can drop a target from 100% to 0 inside a Hammer.
Well, considering Exorcism (If you picked up denounce) will cause the target to be unable to crit. Which in some clases cases, ie; Hunters, As our shots go for double damage, (206% With correct meta, if memory serves.) Inability to crit just kills us. And with i've had exorcisms hit me for 2-6k. Toss in a synapse and divine favor, Hell, with the Denounce debuff up, Even with cds, he could go without healing, doing nothing but spam exorcism, and he'd probably kill me first.
But really, the game has moved on from the point where a healer literally cannot do damage, Holy paladins *burn* in this bracket.
And have to say, The last thing i usually focus in battlegrounds is healers, Why bother hitting something with 16-20k hp, and 600+ Resilience, When there are resilience-less mages prancin' about, Rogues sitting on you, or your healers, and others rollin' without resilience, priest shields, etc. Just my view as a hunter, though. Whole team was hammerin' on a healer, i just picked off all the escorts, the healer died soon after.