With a 6:30 ADR you're probably not going to get out until 8:00. *My* ideal dinner time on party nights is 5:00-5:30 if I'm eating inside the park. This year I have LTT for 4:05, not ideal for me just because it's not really dinner time for us that early. We'll have to adjust our schedule that day to make it work. Since I called late and snagged a cancellation I'm happy just to have the ADR at all, so I'm willing to work around the early time. Some people really like the early dinners though.
we also have an adr at 4:05 for LTT.
it is worth it to eat early. You'll be the done before the party starts. 2 yrs ago we had a ADR for LTT at 4:30. we were seated in about 5 minutes. Before our food arrived, the place was packed. it was so much fun. almost everyone was in costumes. when we left the waiting area was packed. There is no way I would spend any part of the party waiting for a table.
we were done and we were able to walk on all the rides.
early is the way to go.