It was a sad day for me when my guild went under and I started having to wait hours in cities just to find pugs to finish content with, because everyone was busy two-manning, six-heroing crap.
I literally did everything in the game except Urgoz and Kanaxai (because they require more actual people) with a 2-man/6-heroes party Including clearing out FoW, UW and DoA, and vanquishing everything + doing every mission in HM.
Fun times.
EDIT: Wait, nvm, I *did* roll through Urgoz with heroes. It was only Kanaxai that had mandatory party splitting and shit that was impossible without a sufficient number of dudes.