I think all the parks(Disney,Universal and for the most part Sea World) have lots and garages that handle a lot of cars entering and exit pretty well.Universal for example has the two largest parking garages on earth with each one having what seems like 8 exits as it seems you always go out a different way.Disney has like two dozen resorts so people are more spread out when exiting with many taking buses back to their hotels so again its unusual to have extended delays exiting by car,waiting for buses,monorails and boats is another story as those can get bad.Sea World is usually also not a problem except for apparently during their Bands Brew and BBQ days where I have had issues a couple times where cars didn't move for 30+ minutes.At closing during this event they have a concert that pretty much closes the event for the day and thousands of people exit the park at once and this parking lot has fewer ways out creating gridlock.I've told myself after this event ends in the future to just chill in the park for a while.