While I'm slowly hacking away at mobs, I've had people pull theirs over and help me AoE mine down. I've traded buffs with people without saying a word. I've had at least one rogue pop up and scare the crap out of me to help me kill the thing I was killing.
It's been very nice and while I can't manage to thank everyone that's made it an enjoyable experience. (They usually run away before I can manage to get out a quick /ty) I'd like to at least make the effort.
So, thank you!