You have to buy a ticket for at least 3 days in legnth or an Annual Pass through AAA. They will give you a pass to park in the special lots which are at the front, buy the handicapped area. We use it all the time. The pass is now for the legnth of your stay unless you buy the AP which we do. They will ask when you are traveling so the dates on the pass match up.
We park hop and use our car all the time. I have done test runs and except for MK, I can get from place to place quicker driving than w/ WDW transportation. We go out the gate and the car is right there.
Add in the TIW alet parking privs and we are up front on the whole complex no matter what we plan on doing.