We eat at GF every Christmas Eve and Christmas Day, and as long as you have a confirmed ADR (they scan our Magic Band and sometimes ask for ID as well) they have always let us in to park without a problem. However, we went to the Yacht Club to wander about the hotels to see the decorations and grab a treat but the security guard said at that time of year parking was strictly for guests only so we had to leave. Having an ADR should get you in though.