Pfft, a oprerative/scoundrel healer in equal gear is way better. You have 2 HoT's 1 of the AoE, 2 instant heals where 1 removes some negative effects. No need to channel, have cast-times or any of that jibberish. Cant be interrupted except in a way, with stuns. Which just gives 1 of the HoT's time to gather Upper Hand so you can rapid heal after the stun.
IMO, beats a sorc healer any day in PvP. Sorcs/Sages are overrated.