Since you have been so helpful about OKW, I have a follow-up question for your comment. I had intended to rent a car for our upcoming trip (down to just a few days away) and, as you may remember, we're staying at OKW. We will spend most of our time at MK with separate days for Epcot and Animal Kingdom. Renting the car is tough for me. MK's parking lot still requires either monorail or boat to get to the park. However, Epcot and Animal Kingdom are actually better with a car since the parking lot is right by the bus depot.
Given your experience, are the buses for OKW reliable enough for wait times to eliminate the rental car? One big thing for me is that, when I am ready to leave the park, I am ready to go. I don't mind waiting for several minutes but have had times where I waited 45 minutes (typically due to getting to the depot right after the bus had left). Also, I don't have a good feeling for how crowded the buses will be. POFQ/PORS have fairly packed buses. The Contemporary and Wilderness Lodge buses usually weren't too packed.