Yesterday was a level 5, according to easywdw, and MK was the LEAST recommended park...
"Magic Kingdom is going to be busy today. Mondays are usually the second busiest day of the week at the Magic Kingdom, second to only Saturdays, for a variety of reasons. First, a lot of people travel over the weekend and visit Magic Kingdom on their first full day. In most instances, that day is Monday. Second, Mondays often feature longer hours, Wishes Fireworks, and Main Street Electrical Parade, when other days during the week have shorter operating hours and dont offer the Electrical Parade. Anyone who wants to see the evening entertainment will have to visit on a day when its offered, like most Saturdays and Mondays. You can do okay if you arrive at the gate by 8:30am and tour efficiently in the morning, but 11am 9pm is going to be busier than any day this week other than Saturday."