I've been using it for a long time and I can't see anything good about it. I've used healer druid and healer priest and I have to say the healer paladin sucks.
(All I'm going to say now is only in dungeons)
1.- I'm out of mana all the time..."to do this hit the boss with basic attacks to recover mana"...of course, there are many bosses that generate areas that stun and take life away if you stay by their side. A healer being next to the boss healing is suicide.
2.- The paladin healer does NOT have areas to heal. I have to be healing one by one. I don't have to worry about the tank, but the rest of us, pfff... if an enemy damages us all at once, I have to heal one by one (bearing in mind that the healing is 2 seconds and by the time he gets to the last one he's already dead). "Yeah, but there's a glyph that heals the closest players by 10%"... I'm telling you, THAT is not enough and not all the players are together for the glyph to take effect. These are the two points that make paladin healer FOR ME drive me crazy and stop playing it. Said the above that I only use it in DUNGEONS, I know that in raids it is different. How do you use it in dungeons considering the two previous points?