My family went to disney early this year Jan/2007. We didn't rent a car since we spent that 5 days in the parks and no where else. By staying in the Disney Resorts, they had buses for the parks. I think the bus is quite ok, although doesn't come that often and is quite crowed at park closing. If you have elderly in the family I recommend a car or else they might have to stand on the buses esp. during after park closing time. We spent the entire day at the park so didn't really miss not having a car. However, if we had one, I think we might travel a bit off site say to Kennedy Space center etc. It's would definitely be more flexible.