Hello Reed,
The main purpose of druids is support. The ability to evacuate the entire group out of a dangerous situation with winds. The ability to speed the zoning process up with winds. They are there to help with some heals (single healing clouds) as well as do ok damage with direct frags and area. They also support the group with resists, primal fury, waggs, veil of ice. Again, I think you are missing the point. People played druids before healing cloud was out, when it was implemented and turned into basically an anti-death group buff when you had two druids in the group, what was the point of bringing a cleric? What I'm trying to get at is they are a support class that helps in different ways than just 'you suck at helping us kill this mob' They aren't for the min/maxing crowd but they are far from useless. Just like you said, why bother bringing them when you can just replace them with a shaman or cleric? Perhaps shamans need a little nerf, along with corpses to make druids look more appealing.