JL,
I agree, other than for what you get is convenience. Usually after a day out in the hot sun, running from ride to ride, the last thing I want to do is spend another 60 minutes in the car, much less the park closing traffic.
Our best plan has been to show up the first day to hit the rides, stay overnight on the grounds, yes expensive, but oh, so convenient. The second day we hit the water park..which is not so tiring....we then hit the road and drive back or a few hundred miles away.
I also understand from some friends that camping on park grounds is quite reasonable....though with a name like spa girl, not sure that is your cup of tea.
pd
Unchain your lunch money!