What I like about healers is the same gimmick that makes XIV combat still interesting to me, and that's weaving.
Healers have plenty of heals to weave, but unfortunately, their use is conditional on the party needing them or not. That's when AST comes in. The only one that has an alternative from this restriction, and it's certainly my favorite healer.

I like making lists, so I'll divide what I like about each one:

WHM
  • Not letting the lilies over-cap is a nice distraction from all the glare spam;
  • Effectively using the blood lily during a burst window is satisfying;

SCH
  • A "Spreadlo" and Expedience are fun when pulled off at the right time;

SGE
  • Having so many oGCDs heals to choose from is a plus for me;
  • I like swapping Kardia around when someone steps on bad. Those are one of the few times I see Soteria shine;
  • Icarus is fun;

AST
  • Playing cards is by far the best distraction that any healer has from the dreadful one-button spam;
  • Hoarding all our cards for the 2min burst is not very fun, but perfectly pulling it off can be satisfying;
  • A perfectly timed Earthly Star heal feels great;
  • Macrocosmos swiftly filling up health bars is satisfying.

General
  • Pulling off a clutch healer LB3 can be such an adrenaline rush;
  • Really fast/instant queues;
  • I like that on PVP, healers are pretty distinct from one another. I wish some of that could bleed more into PVE.

I tend to think so negatively about healer design that sometimes it's easy to forget the nicer things. Thanks for helping me remember, Ren.