As others have said, you'll have mixed results, depending on the resort. This is a function of their tier (Value, Moderate, Deluxe), proximity to the parks, and somewhat due to their size and size of parking lot. The main reasons are abuse (people parking at a resort to get a more convenient access to a park) and limited space. So, we've had little trouble parking at both Port Orleans, but much more challenge from the MK resorts.
Workarounds:
- Many resorts will let you in if you place your CS order online and show it to the guard at the gate. Con: You have to know what you want and get it right away but if you're going there to eat, this may work for you.
- Use parking for the parks (e.g. TTC) and you can go to the resorts from there. Con: There's an expense unless you are an AP holder
- Park at Disney Springs and take transportation to the resort. Con: That mostly means buses and it'll take time.
- Try multiple resorts and maybe one will let you in. Con: It's a crapshoot and if one turns you away, probably others will too.