I get that, I also find the parking situation frustrating at times, but setting aside MK (where I think everyone agrees the car situation is worse than disney transport), at AK and Epcot if you get there early you park close, and at DHS probably 50% of the parking lot is closer than the furthest bus stops are.
For me it’s having the control. I have waited an hour for a Disney bus before, and I feel like I wait at least 35 minutes at least once a trip. It ruins plans, ruins LLs, ruins meal reservations, as you cook in the sun and wangle increasingly impatient children and feel the anger build within. Worst thing that happens with a car (again excluding MK) is that you walk for as many as 10 minutes. Not fun! But sure beats an hour.