I have another nice trick a druid can do to get a group back up AFTER they have all wiped and are all dead.
If the group wipes out completely and all die, make sure they don't go back in. Have them wait there while the druid checks for respawns. If enemies have respawned at the entrance, you will have to fight your way in and lose progress... or you can use this trick. Since druids can stealth in cat form, and rez in caster form, you can actually get back to your group and rez them. Just pop on your stealth and sneak carefully into the instance, staying as far away from the mobs as possible. Once you reach your group, just rebirth the healer and you're good to go. I have actually saved an entire 40 man raid this way. Sometimes it's actually worth waiting for the rebirth to finish cooling down once the druid gets inside.