Have been in the same situation many years ago but it was Christmas Day, it rained so hard virtually everything was cancelled, MK was packed as you can imagine then trying to get back on the resort buses was a nightmare with huge lines with people pushing in, not a Christmas Disney I remember for the right reasons. For this reason I will only do special events maybe the day before, it may cost a little more but at least you don't waste a lot more! We go to the airport tomorrow for our flight early Thursday morning 9 hrs later in the magic again!