I am wondering which places are notorious for having a long wait after the time of your ADR. For example, if we have a 6pm ADR at a restaurant, how likely are we to have to wait until 7 for example to be seated? Also, are there any repercussions for cancelling ADRs the day of? I have a feeling my husband will not be willing to wait a long time if we are supposed to have reservations. Lastly, is there someplace in the parks where we would be able to go to cancel an ADR? I can't guarantee that my kids will always want to eat where I picked but I feel it would be more fair to cancel ahead of time than just not show up.