Guests visiting any resort during the day or evening are not charged to park. However during specific periods: Holidays, construction or during conventions that may be hosted at any of the resorts that have convention facilities or when the parking faculties are full. You may be turned away unless you have and ADR or a Hotel reservation.
All of the parks charge for parking on a daily basis. The hotels began charging for overnight parking for any reservation made after March 21, 2018.
Dave