Now that my feral druid is getting higher in dps and crit, I really enjoy farming/gathering with the druid. Like others said, he has the heal ability. Another thing I find useful is the humanoid tracking, in contested zones. Most of time I may have another track on but if I know someone is in the area, I’ll switch to humanoid.
Instant flight also helps in some cases, when you just want to wait out the patrolling mob before getting back to the item you were gathering.
If you need to escape but are in battle already, cheetah gives you a prolonged speed, or bear lets you take a beating as you beat it out of the area.
If I farm things under water, like elementals or water herbs, then water form lets me regain breath without panicking and rushing up to the surface.