My first mmo was Runescape. Then I played WoW. I got into healing in WoW, and that became my favorite thing to do in an mmo. After WoW changed too much for my tastes, and I wasn't willing to pay for the expansions anymore, I played quite a few different mmo's and stuck with Tera for a decent amount of time, but not long enough to get to max level. Then I just stopped playing mmo's altogether for a while. I liked Tera, and I was even ok with the quirky healing style, but the problem I had with it was that there wasn't enough group content. There was like a 10 level span with absolutely no dungeons I could queue up for. That killed it for me.
But I'm starting to miss healing, and want to find a new mmo. The problem is that most reviews seem to be geared toward people who play as dps, so it's difficult to figure out which mmo's are fun to play as a healer.
Just one caveat, if you will indulge me- I want to be able to level up pretty much exclusively by running dungeons, so that has to be something that is common in the game. Unless, of course, the quests are actually fun and entertaining, rather than kill 10 rats type quests.
Old games are fine, but if you suggest an old game, you can't just say "it's a classic, you whipper snapper!" you have to actually tell me about the healing in the game.