This statement isn't quite correct. The current bus loop is further "inland" from where the charter lot used to be. The charter area used to be right next to the lagoon in this image.
The current loop actually stretches all the way to the entrance road coming from East Buena Vista Drive. If your bus happens to be near the end of the loop, you'll be walking much further than if you used the parking lot shuttle.
That said, unless you have mobility issues, I wouldn't use the distance as the sole reason to drive instead of take the bus. But, that's just my opinion.