If you have the gold, dual spec both the druid and the shaman, hell you could make the pally holy and the druid feral too if you wanted to change it up)

From what i've read, Druids have to be very proactive and roll a lot of hots to be mana efficient. They need to be casting heals before anyone takes damage. Shaman can be reactionary, only casting heals whenever dmg has been dealt.