yup.
parts of the shaman hp buffs will stack with the cleric hp buffs, their slows have a heal worked in, they have a "sluggish" proc...
running 6 toons to a camp is also a major pain, so ports are lovely, and druids get snares & DS's that add to group dps...
shaman heals seem more aligned with heals over time while druids are more instant heals
I tried both and ended up happier with a shaman than druid. Fortunately my druid is on a separate account and I can log him in to port my group around when needed.
At the end of the day both are totally viable options, the shaman buffs in my personal opinion will strengthen your melee toons a lot whereas a druid doesn't have a the stat buffs to offer.
*also, you could just level a druid / wizard for ports on a F2P account and use them when needed.