Yeah we have a 2-Bedroom in January as well; and you're right - they are GINORMOUS!
We have always been satisfied with park transportation. There are 5 bus stops and the buses have to loop around to all of them on each trip. This part can take a while. The final stop is the main building, the Hospitality House. OKW has a dedicated bus line, so you will never have to stop at other resorts. Bus lines are: Magic Kingdom; Epcot; Studios; Animal Kingdom-Blizzard Beach; and Downtown Disney-Typhoon Lagoon.
There is also a boat from OKW to Downtown Disney that is nice. The launch is adjacent to the Hospitality House, on the opposite side as the bus stop.