If you are a family, it would probably be cheaper just to upgrade to one of the higher hotels.
And isn't the Express Pass that you purchase different that the priority that on site guests get? I thought Express pass that is purchased limits the numbers of times you can ride a ride. Oh nevermind. Just looked it up on their website and it appears to be "unlimited". I thought that when we stayed onsite in 2012 they used to limit the times you ride.