Last year HS was very light on crowds, BUT that was before TSL opened. We are doing it again on Christmas Day this year, but expect a slight rise in crowd level. HS was very festive last year. Decorated well and great atmosphere. We did not arrive until around 10:00 for our RNR fast pass and stayed until around 8:30 and we rode RNR about 4 times, TSM 3 times, watch the shows and soaked up the atmosphere. We had such a good time.
We are spending Christmas Eve at MK again this year. It was crowded in the afternoon, but we had a solid plan and managed quite well. We were there at 7:00 am for EMH and stayed until almost closing time. It too was awesome.