We just got back from OKW renting points. We traveled with our 3 kids, ages 4, 2 and 2. We were able to use the Magical Express to WDW from the airport, and get all the extra magic hours and all that good stuff as if we had booked directly with Disney. We did rent a car though, just in the interest of traveling with the little ones. The bus service can be pretty slow, and it made it easier to get out of the parks quickly and back to our room. The only place I would not recommend driving to is the Magic Kingdom, as the parking is horrible, and you still have to be ferried into the park.