I do every quest. I don't repeat heroics or grind mobs, at least until I'm at the cap for alliance crates and command levels, but I've never been able to skip content. I should probably clarify, I don't skip content that's not gated by Ops and/or PVP.
I play MMOs like ever expanding single player games.
E: come to think of it, I think that's why I never got into WOW. My friends wanted to rush to the end game and I wanted to explore the maps and read the story, at least the first time through, and do all the quests. That's how I ended up in LOTRO, I wanted a game that was more about the journey.
I'm weird that way