I went with my parents and my sister sometime in the early/mid. 80's. I think that it was around 1984/1985. We stayed for a week in one of the wings of the Contemporary Hotel. I remember that it was SO tough to get reservations on site that you had to book like a year in advance. There were no discount codes, so the trip was really expensive too. We were supposed to go the year before we went, but we weren't able to get the hotel room.
What a change from back then to now...DH and I have taken absolutely last-minute trips and stayed on-site plenty of times now!