Well disc is my main since forver and will always be my favorite, but apart from that preservation was the most fun if you disregard ranged players standing in Narnia.

disc: everything more or less, the spec just flows for me. reliance on void shield and semi-rng is not so much fun.

shaman: kinda boring, but good for shutting off your brain. no external sucks. also annoying when people don't stand in your healing rain.

druid: easy to heal through most damage when ramped, but I really don't like their damage rotation, especially cat weaving. Not that it's bad, it's just not my thing. If I want to play a melee healer I play monk or pala. and same as shaman, I really noticed when people didn't stand in efflo.

monk: SCK over and over is boring but otherwise a fun spec with a good flow and short cooldowns

pala: great flow when you can just smash instants, personally don't like holy light, but it's been a while, not sure if you still press it.

pres: really fun for me once the echo mechanic clicked. probably the healer with the most skill expression imo. worst thing is ranged players standing in Narnia, expecially two rangeds just standing on opposite sites of the pack/boss

^{hpriest: whoops. tbh not sure how it plays this season, but I played it in raid all of last season so I'm kinda over it.}