You work the front desk at a hotel servicing the #2 convention center in the country. Guests ask where the nightlife is. Which is easier:
(a) Get in your car, drive up this crowded street for 2 miles of bumper to bumper traffic and turn left.
(b) Get in your car, drive two exits down I-4. Yes, it's still Disney World, but no, it's not $100 to get in.
(c) See that giant roller coaster up a couple blocks up? Right there.
The I-Drive demo doesn't live on message boards/Twitter talking about theme parks. Not looking to spend the day somewhere, they have seminars and breakout sessions all day, let the kids go. They're looking for a party and maybe something cool to do for an hour in the evening.