I know this is for crowd control but I hate how they do not fill the stations with people. Just something about that annoys me. To me it makes the line appear longer than it is. Also on some of the coasters you could not choose your seat - they told you where to go but at only certain times of the day. But as long as I ask I was able to sit where I wanted.
I'm actually the opposite. I love it when parks hold back the line to prevent the station from being over-crowded. Especially during the summer months (when it's really, really hot), it's nice when you enter a station, and you only have to wait 1 train to get on. I feel like when there's a huge line for a row you're in line for, it takes ages to get on since 2 people board at a time. So I love it when you're not crowded in the station.
Just my thoughts.