There's some nice druid gear to be had in instances, it's just not the set gear. It's the non set leather that rogues want (though in most situations the rogues would be better off with their set pieces).
The problem is that druids are expected to heal in PvE, and end up stuck in a healing spec because of it. A feral druid who doesn't 100% focus his gear on melee dps can be great in pvp. They can do decent damage, yea, but the ability to do decent dps from melee OR range, and the ability to heal, combined with the ability to jump so quickly from one role to the other makes them powerful. Oh and a good druid in warsong is godly. I've seen druids solo ninja the flag from the enemy base with 10 defenders lots of times.
As for if anyone starts horde when BC comes out, I'll be rolling one. I plan on making a Blood Elf paladin as an alt. I'd love to play with you guys, but I know a lot of you like to play on PvE servers, and that would drive me crazy. Plus if I make him on the same realm as my rogue, I can get him geared up with epics fairly easily. (Blackwing Lair is often run with alts, and a lot of the guild has alts in tier 2 gear)