Positioning

Always stay close to one another. The radius of healing spells is not big enough to heal you if you are too far away. For instance, Healing Word, which has a huge radius of 80', cannot heal people on the other side of the platform in Cradle of the Death God. And most spells have a much smaller radius. Many healing spells have to be targeted at a player now (and this is really dumb, but that's how it is), so if you need healing, don't rush away and try to make yourself easily targetable. Always move around the monsters rather than rushing away, so that you do not stay in front of them but stay in range of your healer.