In my current group, we have WHM (me) SCH, DRK, WAR. I heal the DRK while the SCH heals the WAR. I solo heal the entire first 40% while the SCH stays in cleric stance with Selene. After the split, I keep regen up on both tanks, but other than that, I almost never have to heal the WAR. My co-healer takes care of that.