For what its worth i'm going back a few years, so this may have all changed.
Being in the UK, I am not comfortable driving long distance in the US, so we resorted to the easy option of doing the shuttle bus.
It was $5 each return, which seems ok, but the bus kept making multiple stops, even changed driver, before heading out of Orlando at roughly the same time the park opened.
Basically, by the time we got there, it took about 1hr 45min, which was lost on our visit. We also had to be back on the bus before the park closed. We was not happy losing valuable park-time to unneccessary delays and premature return departure time.
As I said, it was a few years ago and this my have all changed.