Yup.... It's not just a pass for parking at the TTC (or other parks), it's also a parking pass for the Fort and shows that you are staying on property if you go to OTHER resorts.
Your choices for entering the resorts are either the MB for the resort you are staying (the MB alone won't get you into other resorts) or you have to stop at security and declare your intentions (Dinner reservations, shopping, Checking out the resort for a future visit, etc....) As I understand it, the paper pass is only for Parking in the various park parking lots AND to identify that you are legitimately allowed in the "Guest" parking area for the resort you are staying at.