The same rules would apply to someone visiting a guest as would apply to someone who just wants to come into the resort and take a look around. Some resorts will permit it without a problem. Others will turn them away and advise them to park at one of the parks (or Disney Springs). It will all depend on the guard at the gate and how crowded the parking situation is. IMO, you are less likely to be turned away at WL than at GF or CR, but there's always a chance.