We have had very different experiences than the other posters.
All of these happened DURING
free dining.
At our LeCellier dinner, we found ourselves at Canada an hour and half early. I was exhausted and just wanted to rest. So we asked if we could check in. We were told we would have to wait that hour and half until our ADR time. We should come back. I said, that is ok, we'll just check in and wait there. (truth be told I wanted in that air conditioned waiting area...lol).
Within 5mins we were called to our table, seated and ordered immediately. We were done eating, check paid and was leaving just as our adr time came.
We always go early to Ohana. I try to get there an hour before our adr, simply to enjoy the Poly atmosphere and have a drink. While we are not seated as early as LeCellier, we are always sat before our adr, whether it is 5mins or 15mins.
Another time we arrived at LTT 2 hours before adr for dinner and asked if we could eat early, they said sure, seated us and had a wonderful time.
We have shown up to both Crystal Palace and Chef Mickey's 1/2 to and hour early and have been seated within 5mins.
The longest time we have ever waited was at Crystal Palace - when we arrived 5mins before adr time. We waited 20mins for that one. ----go figure!