As healer, I recently unsubbed because healing (especially in pvp) is to me too slow. Annoying and unsatisfying.
I remember having the best fun during wotlk. After it, everything started to fade out.
I am very sad because I enjoyed many aspects of Legion. Really immersive story and all. It's a masterpiece, no doubts. But the HPS is ridicolous and I can't enjoy the game as an healer.