If your trip hasn’t happened yet, and you don’t mind spending a bit extra money, take a MinnieVan. They are considered Disney Transportation, so they use the guest entrance gates to the hotels and bypass the guards. We had dining reservations at Epcot last week and took a MV to BC and had zero issues. Our driver asked us if we were staying at BC or had dining reservations there, and we said no, we were going to Epcot. She said, “Oh, fun.” And that was that.