Yeah, what about the traffic you encounter LEAVING the show if you want to see the headliner, hmmm? That's my main beef. I get there early enough to avoid the morning crap.
Parking backdoor style usually scratches out this problem as well. All 3 days this year my friends and i were in Lot 4 or 5. Main sacrifice is the hike to the main gate which takes about 20 minutes (new water from car to main gate is pretty much mandatory and will be gone by the time you are getting checked out by friendly yellow and baby blue jackets). Leaving was smooth all 3 nights (made even smoother by the excellent driving skills of our exit driver) and i felt we didn't wait at all to get out. Going in was great day 1 and 3, but some unexplained crazy jam on the back road day 2 fucked us from seeing the Fratellis. That day was almost the same as being on Monroe and we were at a snail's pace for an hour plus.