I'll do Wolf Trap if I *really* love a band, and they have a pretty mellow vibe (ie, Lyle Lovett). But Nissan never again -- I went out to the Pearl Jam/Buzzcocks show, and it was a nightmare. 2 hours to get out there, and about the same getting back. I coulda driven to Phillie (if I drove pretty fast). And the Buzzcocks, one of my faves, was just weird in this huge place with almost no one in their seats yet (a combination of kids who could get out there early but don't know the Buzzcocks enough to give up an hour of tailgating, and everyone else still stuck in traffic).
I agree with you, mjnova -- the big summer festivals have me saying the same thing. "Screw it, I'll wait 'til the bands I wanna see come through the Black Cat, 9:30 Club or Ottobar."