Our family has been to WDW for the past two MLK weekends and will be returning this Jan. We arrive on Friday and leave in the afternoon on Monday. We have never been in any of the parks on that Monday but rather have done Downtown on that day.I'm not sure if we will do that again this next time or try out Epcot. Anyway, we have never encountered any huge crowds the last two years. We have always been able to tour easily and do most everything we wanted to do given it is a long weekend trip. I probably would not try to do the MK on that Monday. Maybe try another park.