POP has excelent bus service. In January we never waited more than 10 minutes on a bus the whole week. We have stayed from deluxe to value and POP has had the best service. We never move our car the entire stay. That being said ,we try to make our ADR's near where we want to be anyway to reduce time spent on the bus. For example if you want to eat at a monorail resort, do it when you will be at MK. Just grab a monorail to the resort. If you want to be a the boardwalk, go from Epcot. It really is very easy to get around and the bus drivers are great at getting you where you need to be. more than once we have had the driver take us somewhere we needed to be but the bus was not going.
You will enjoy POP!!