Always do busses to a park, unless we're combining a meal at a resort with a couple hours at a nearby park, and then we drive and valet park. We don't do anything different when stay at OKW. But we spend most of our time at VWL or OKW, so we're used to the busses.
I believe the only times we've been in a theme park parking lot in 20 years is once in AKL and this spring in Epcot when DH had to be there early for his Segway tour and didn't want to take any chances on not being on time. (But we almost always drive to resorts and DD)