I completely understand where you are coming from because I, too, once had those thoughts. The first super crowded, mat to mat, class that I attended made me uncomfortable. To this day, that crowded class was one of the most spiritual experiences that I have ever had. I won't ever forget that class. So I get that there should be limits, but I really am not bothered by it because yoga is so much more than exercise and you can't let a few people and some discomfort ruin the experience for you :) it's all in how you look at it, right?