I dinged 80 recently and it's true, there really isn't much you can do without a hc raiding guild. There are almost no pugs raiding and if there are any, they require 4k+ gs for naxx10, which is completely impossible to get. Hell, even for daily hcs you get spammed by 3.8k+ gs only.
I'm not a clueless noob, I've raided and cleared full heroic raids on retail, but there are only two viable ways to get past the gs wall - join a hc guild and hope they'll boost you for a while, or what I'll do, wait for s7 to start and rush ratings in 2v2 for the full relentless set.