I have never played a healer in ANY MMO ever that spammed a single DPS skill more than 100 times in a dungeon, representing at least 70% of the skills used.
i have never played a healer in ANY MMO , even in a pure healing spec, where i was limited to only 2 DPS skills or three DPS skills- I didn't have many in that spec , but i would have a couple more, and with classes that had almost no self-heals.
I'm not asking for sympathy from you, it really doesn't sound like you know anything about healing ,based upon my experience it doesn't fit any game I have played within the past twenty years.
