This is a tank perspective, but healing has seemed less necessary in dungeons. Numerous times I've seen a healer stand in AoE from mobs or mess up a boss mechanic, die, and the party finishes fine without them. It's been so common I've wondered how healers are feeling about the increased tank mitigation + dps support abilities.

I suspect we're dealing more with gear being lower since it's a new expansion and some tanks aren't used to needing to use their mitigation as much.