they're not entirely essential, but they offer:
protection of the glades (good +mana regen hp buff for casters)
ports
succor
spot heals (chloroblast/nature's touch p goog)
resist buffs (circle of summer/winter)
thorns
regrowth
debuffs (ro's fiery sundering, fixation of ro)
it's really nice having around 3 or 4 druids on a raid, but any more than that and there isn't much of a benefit
on the other hand, you really just can't ever get enough clerics, shamans, warriors, rogues, enchanters
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