I loved PVP healing on my Sage. Since 1.2 I tried trying different tactics, specs, and healing styles. Ultimately none of them made me feel like I was still pulling my weight in a WZ.
My overall healing numbers are still decent, but my ability to stop people dying, even when I'm healing a 1-on-1 fight, seems much worse. Instead of being a fight that is now 2 vs 1, I feel I'm really just making it 1.3 vs 1 and that we would be better off if I was another DPS class. The rate that damage can be poured in to a target makes the amount of healing I can put in to them insignificant.
It used to be that a bad player could largely be dealt with while still healing others, a good player would shut down my outbound healing, and a great player would send me fleeing for safety, popping cooldowns. Now, any player can shut me down and send me fleeing. Even ones that use their abilities and CDs at the wrong times on the wrong abilities (of mine) will still mess with me enough for their brutal DPS to take me down. Against a good player I'm pretty much dead any time.
I tried WZs with my guild and using Teamspeak. Even with guard on and calling for help the moment someone's on me, I have seconds for them to intervene. Even when they are able to actually save me, is that what PVP has to be for me? Never PUG, always guarded, never 15metres from a tank? Instead of being a fully contributing player on the team I feel like a walking "Killing Blow medal" companion.