We were there two years ago at that time and it was VERY busy. That said the parks (MK) opened early, 8:00am, and stayed open until midnight. The weather was beautiful and warm. We were at the gates at opening and did the "must do" rides and then looked around as it got busier. We napped in the afternoon and then went back in the evening for parades, fireworks etc.
We went in Feb. last year and didn't like it as much. No crowds ...but the parks closed bt 7:00pm and the weather was cool. As long as you are early risers and "go with the flow" with the crowds, you will be fine!