Ok...before this gets heated, and it will,
Too late 
...........
many have parked at resorts, had breakfast and then headed to a park for the day. For instance, park at the CR, eat at Chef Mickeys and then walk over to MK. Does Disney want you to do this? No. There are parking lots for the parks for a reason. There are lots at the resorts. Lots at the resorts are for the use of those either staying at said resort, or using the amenities of that resort. Parking, for park access, is not supposed to happen. At busier times of year, or during special events, they have signage up to that fact.
Can you get away with it? Yes, you can. And you may run into a CM that tells you it's perfectly fine to park there all day. But, if you ask anyone in authority, they will tell you that you can valet park and go anywhere you want for the day. If you self park, you are entitled to park there while at that resort...not for the next 12 hrs while in a park.
Generally speaking, those that want to park at the resort and then head to a park, are trying to avoid paying parking fees. And no matter how you look at it, that is wrong. They are supposed to 1. move the car to a park lot after eating, 2. pay to valet park at the resort, or 3. park in the park lot and then get to the resort via Disney transportation. (in this case, park the TTC, and monorail over to the CR, eat, then head wherever you want)
So, do what you feel is right.