We were at TL last week and left at about 1:00 after they announced that there were as many people in the park as there were chairs and to please only use one chair. The parking lot was closed to anyone new coming (we asked about coming back later, and the CM said as long as we used buses it would be fine, but the parking lot was closed).
I was also at DTD around 2:00 the next day and we had to go by TL on the bus for a pick up before going back to the resort. There was a sign outside saying the parking lot was closed (or something like that). It was full, in other words.
I think I have read on this board that if you go after 2:00 it starts to thin out, but we haven't tried that.
We have one more plus to use on our tickets and will probably do BB next year with that, and after that I am not buying any more pluses. We went to DQ and it was packed and not enjoyable (we went at 11:30 AM), and I didn't like the crowds at TL (although the first 90 minutes we were there was very nice and we did get to do most of what we wanted to do). I know the parks are crowded too, but we were hoping to use our pluses for something to do on a non-park day to relax (but it wasn't relaxing).
I am looking forward to the day when my kids are out of school and we can go back to visiting Disney in September. School break times are crazy! BUT they are better than no Disney at all.
DJ