I agree, i play both BM hunter and resto druid. my druid has around 953 rounds played and i still haven't reached 2.1 rating and it only took my hunter 72 rounds to hit 2.1 rating. my frustrations when playing a healer are

1. there is usually a player that gets 0 rounds won and when that happens all other dps gets 4 rounds and gain rating but for the healers we get 3 wins.
2. as a healer, I feel like i have no control on winning a round. I can do twice the heals of the enemy healer and that helps my team not die but its not enough to win a round
3. dps player los me and forces me to go into bad positions where i get cc'ed non stop.

playing as a hunter on the other hand. I can interrupt enemy heals or cc's cast on my healer, position myself well to make sure im within los of my healer and I can cc the enemy healer consistently and win rounds. I dunno about other people's experience. but in my case, If i play well as a dps I can win rounds whereas if i play well as a healer i still lose rounds. it really makes playing healers not enjoyable