I totally get the desire for a Disney wedding. We've never attended one, but we've seen a couple in progress from our hotel room at the Disneyland Hotel once. They looked awesome!
A coworker of mine recently got married at a venue that was about 2 hours away from most of the relatives. She rented a "party bus" for the older members who she wanted to attend, but knew would be unable to drive that far.
Is it possible to have a local, inexpensive reception or BBQ after your wedding?
Ultimately, it's your wedding and you are paying, so I think it's your choice.