I'm interested in this conversation. On our arrival day (staying off site and renting a car) we are hoping to go to Captain Cooks at Poly for dinner and then maybe wander the resort some and, if my young kids are up for it, stay to watch fireworks from the beach. This thread seems to have some conflicting info re parking. I was under the impression that you could park at any resort for daytime use but would usually have a time limit. But is that not the case for Poly? We'd rather not pay for parking at TTC on a non-park day.
Here's my experiences from January 2020
Friday January 10th
Arrived at Poly around 2 pm or a little after. There was a sign as I pulled into the guard house that said "Parking for resort guests & dining reservations only" or something close to that. Guard asked how they could help me. I said "I'm here to have lunch with my sister." Showed my ID and guard let me through to park. Didn't ask which restaurant I was going to, even though we were planning to meet at Captain Cook's and so I didn't have an ADR to show her.
I didn't receive a time check or any type of limitation on how long I could park there, although we only stayed for about an hour.
Saturday January 11th
Arrived at Wilderness Lodge around 10:45 am. Guard asked how they could help. We said, "we're here to have lunch". Showed my ID and guard let me through to park. We did have an ADR, but the guard didn't ask where we were eating. We didn't receive a time check or any type of limitation on how long we could park there.
After lunch, we decided to take the boat over to Magic Kingdom for a while. Stayed at Magic Kingdom until around 3 pm when my boarding group for ROTR was called. Took the boat back and picked up the car around 3:30 pm. No issues or problems. I did pay for parking at Hollywood Studios, so Disney got their parking money from me for the day.
If there had been different guards, would we have had a different experience? Possibly. Worst thing that can happen is you get redirected to park at TTC, so it's worth trying, in my opinion.