sounds to me your friends are a bunch of Loot h*res. if they were real Friends they would help you level by running you true heroic quest each day and help pay for a respec.
Find some new friends because these arent even worth to be called friends.
now to go on topic Dual-spec isnt needed, your all just spoiled by all the other mmo that have it. i rahter have a good healer or tank then some 1 that switches to his second spec with crappy greens to match it no idea how to heal/tank or use his skills and make a FP last 2 hours instead of a hour or less