We go often and have noticed that BB tend to fill to capacity sooner then TL. When this happens, they will send people over to TL is there is still space. Then they usually wait until 2:00 before reopening the parking lot at BB. I suppose it is better then waiting until 10 people leave and then letting 10 people in, they just reopen at a set time.
We prefer TL and have never had a problem with it being closed due to capacity, even during the summer. But I am sure it does happen. If you go to TL, the best place to have as your home base is by the new ride. It amazes us how many empty seats are over there. And there is a small swimming area there that is nice to cool off in and it's not as crowded as it is over by the wave pool. Just find the locker rental area and across from that is the woman's restroom, head towards the rest room and keep walking past it, the path will lead you right to the new ride.
Have fun.