I've been spending quite a bit of time at the Nick Hotel lately (Chernabog, do I know your girlfriend? I know there's quite a few Rosen students working as interns there right now), and I've noticed that a LOT of the people there aren't going for WDW. While some go, most view it as a resort onto itself. They want to know about the Nickelodeon Activities, they want to go to the place where Slime Time Live has been filming for the past few weeks, and they want Spongebob.
Believe it or not, most kids that watch Disney Channel like to watch Nickelodeon as well, and unlike us adults and our brand snobbery, they could care less which brand owns the franchise/characters.