The VIP lounges have corporate sponsors. For instance Kodak sponsors the lounge at Honey I Shrunk the Audience. FedEx used to have one a Space Mountain. There used to be more lounges but after Sept. 11 many of them closed, like FedEX. I know when the parks have VIP's or the corporate sponsors have VIP's they give them a pass for the lounges. I've been fortunate enough in the past to use them, not because I'm a VIP, but because of a family member. Using the lounges is a wonderful treat. They are air conditioned, have clean restrooms, and cold drinks. Of course the best perk is no line to wait in for the attraction. They just take you right on through a "back" door.
I'm hoping to be able to get the pass again on our next trip. If I do, I'll report back about Mission:Space.