Sorry I edited my reply as you were replying to it. I tried follower dungeons as a healer, especially since Evoker healing is so very different from anything else. The result is horribly slow, with boss mechanics primarily targeting me (as designed for follower dungeons) and NPC DPS making the instances take forever. Follower dungeons are good for introduction and idle time wasting, but not for the group dynamics and responding to unpredictable players.