You are expected to move your car after breakfast.
When you drive to a resort for breakfast, touring it, or whatever, then when you leave you should drive away. So far no foolproof procedure has been developed to let guests park for more or less exactly how much time they will be there such as for a wedding reception but much of the time guests not staying at that resort have been given 3 hours.
The problem with parking at the resort all day while walking to other venues is that you car is occupying space that might be needed for someone else, staying at or visiting that resort.
Loophole: If you use valet parking your car may remain there for the rest of the day and you also get free valet lot hopping unless the valet who services you tells you otherwise for that particular entrance.
Another choice, park at Hollywood Studios. Disney currently has the exception whereby guests may park in one of the theme park lots and leave their cars there while going to other parts of the entire Walt Disney World.