I'm close to clear SoO hc and I'd want to play a healer after that until the next expansion. Until now I've only played with paladin but I'd not mind to level another (I used to have 4 alt. healers on cata, but this expansion is not really alt-friendly so I stopped playing with alts).
I don't really like the current paladin healing style, aoe spam trying to get shields on people and that's it. I guess (I could be wrong) disc priest and shaman are more of the same, aoe spam doing always the same so I'd like to ask if there is some healer without a strict rotation. My initial thought was either druid or monk.