Your prepayment will get you through registration faster, but won't help you with whoever is in line ahead of you. They've been doing this for a long time, however, and the line will move right along.
If you've never been, you're not going to believe the size and scope of the event. If you have bikes you can travel with, they'll come in handy for getting you from your campsite to the entry gate (you can't take them into the show areas). Hopefully you have some light weight lawn chairs that will be easy to carry down to the flight line for the air shows.
You'll never be at a loss for something to do or see.
Jay & Peggy Monroe with Dolly
Can't take it with you - don't plan on leaving any behind
2016 Newmar London Aire 4553, Spartan chassis
Wrangler Unlimited toad