Oh but we are staying at Disney! (We have a dvc timeshare and so staying on property we are okay with the parking so that helps in the decision too).
That's what made it hard to decide about a rental, I mean we are staying on property and we get the use of it's bus system but when it boils down to it, as I said, the time of year, the
recent problems with less buses, means more people on the buses, more time constraints, more headaches than if you used your own car, whether you drive to off/on property hotel, regardless of the cost of gas ($4.57 here in North California)!
Previously we have stayed at Boardwalk and could walk to Epcot & Hollywood Studios so the only concern for transportation was to Magic Kingdom (we usually skip AK) but this time we are staying at Saratoga Springs. I think a car is the better way to go, even with gas prices!