One thing I cannot believe hasn't come up so far is the expertise stat.
At level 50 people will start gathering expertise gear, expertise currently increases damage done and reduces damage taken. So assuming 2 opponents with equal expertise, this will cancel out.
However, expertise also increases healing done, which means that as a healer, you'll have a damage reduction and a healing increase to go against your opponents damage increase.
Of course, this just assumes that the people posting in this thread aren't all running around at level 50 with full pvp gear. Having not been in the beta (/wrists) I am unable to say what effect this actually has on endgame pvp, however, maybe someone who has some experience, or has reached level 50 and gathered some pvp gear can post regarding the changes this makes?
On topic (by which I mean opinion stated as fact) I enjoyed my brief time healing in pvp as an inquisitor, so it is therefore fine.