Pretty much. Back when I used to play WoW I would go on Ventrilo to raid, and I'd never say anything. I think I probably said two words the entire time, and when I did, people would be surprised.
I never wanted to be squad/platoon leader or be an OIC in MAG because then you have to talk a lot, give people objectives to do, tell them to use certain routes if attacking etc. :\ I loved being a squad leader when I was with real life friends, never tried being platoon leader or OIC because then it wouldn't be just 8 people in my squad but 256 in all the squads and platoons! *shudders* I don't mind chatting with people I know, but I feel weird talking to strangers online.