SCH - My preferred healing class and favourite class overall, I like the abiltiy to keep everyone topped up with shields and go to town with good DPS
MCH - I am not an amazing DPS myself, but I love the complexity of the class and nothing is more satisfying than the opener, getting better with my sustain too.
SMN - Things melt and you can finish with a delightfully bright pillar of death, what's not to like?
PLD - I know its technically the "weakest" tank atm, but I like running as one and I love my big pulls with a Hallowed Ground at the end.
WAR - Something about smacking things with the broadside of an axe is so satisfying, the animations and sounds for it are delightful.