In my tank and healer roles I definitely try to take one for the team, although I can't be sure EVERY morph I have chosen was for the team. I find some team buffs just not worth it.
As well, my skill bar I use for group content is different than my questing bar.. So... I pick the "me" buffs if it is part of my questing bar
I would rather give buffs to my teammates than myself.
a well placed rapid maneuver can win a keep, much better than me putting a damage shield over myself and trying to play it like a COD game and solo everything.
Plus I suck horribly, so it benefits me to help my teammates, who in turn cover my butt in battle:D
I will admit though, as a stamina based NB who will not have access to vigor for the next 5-7 months.... its kinda hard to buff teammates:(
it can be done though.