Just my 2 cents worth (& you probably have change coming):
The past several times we've parked at EPCOT (we are local), they have parked us in the furthest lot an hour before opening. There is no tram that goes by that lot, so at the end of a long day, we have to hike a good long ways while those that got there long after us have the option to take the tram somewhat close to their autos. If we take the tram we still have to walk the width of one entire lot to even get to our lot, and we are usually at the far end of the row. Would I pay for closer parking? Depends on how late I plan to be there and the weather. I doubt I would do it every time, but I would be tempted after 4 or 5 long hikes in the summer heat.