Having a couple healers on follow worked extremely well for me in large encounters like AV and WG. I ran a holy priest in mediocre gear and my paladin as holy (would be much better off as a druid). It kept me alive for ages just spamming a few spells - one because of the healing and two because I never had to stop DPS and the more people I kill the less damage I will take.

I think two druids or druid/priest would be a great combo for your group.