DD9 and I went yesterday after school. Arrived about 1:30 and stayed until 10. We only did DL yesterday. The crowds were fine until DCA closed at 6. then you saw an increase in crowd levels. Still, most ride waits weren't too bad. Of course, we used our FP from earlier in the day and didn't have to wait at all.
Today will be more crowded just because it's a weekend even though S.C. Select AP, like me, can't go.

My advice would be to get there early, at park opening, but that's already happened, so.... go and have fun. Grab as many FP as possible. Enjoy the decorations and see the fireworks. (They were delayed almost 20 min. last night, wonder why?)