I went to Tokyo Disney Sea. It's for the first time in a year visiting for me. I feel the times of visiting Disney are decreasing... I used to go the Disney Landthree times in a year at least.
This time, because festival of 25th anniverasary will start soon, closing time of Land is at 18:00. So I chose Sea which open until at 22:00. It wasn't crowded when I went to Sea. This time, I didn't need waiting for more than 10 minutes to ride all attractions! The waiting time of "Center of the Earth" was always only 5 minutes whenever I try to ride it. I only waited for 10 munites to ride "Tower of Terror".
I'm sure Land is more crowded than Sea. If you are a worker, I recommend you go to Disney on weekdays taking a paid holiday.