We did POR last November without a car. It really isn't a problem. Fantasia Gardens is tough to get to, but we did Winter Summerland without a problem - its right at BB (on the AK bus route), and after BB is closed, they run busses back to Epcot, where you can spend the evening, or hitch a ride back to POR. There are busses and (if its running again) a boat to Downtown Disney for DQ. Downtown busses run to Typhoon, although it was closed last fall. Going between resorts is always more difficult - usually requires a transfer at a theme park - thats what we did to hit the Wonderland Tea Party at GF. Personally, I think a car is more trouble than its worth at WDW.