Weekdays are usually better than weekends, but I was there last October on a Wednesday and Thursday and it was more packed than any Saturday in June I have EVER seen. I think a lot more people are taking advantage of the 50th celebration (or strollers are getting bigger and taking up more room )
They will update the calendar as special events, closures, conventions, changes in extra magic hours, etc.. effect the projections. So, check it frequently.