We (briefly) were in a dance class for 18 month thru 2.5 year olds. The teacher made several comments about keeping kids on track and I always felt they were directed at me b/c while everyone else walked in a circle, my DD would wander all around exploring. When other kids dutifully got up to march or whatever, my DD would want to nurse for long periods. It got to the point where she told us that by 18 months we should do like she did and put our kids down and force them to do some activity for x amount of time. She said something like, "they'll cry and they'll beg for you, but you have to be firm or they'll never become independent." It's one thing to BE an utter moron, but it's another to force your lack of wisdom on people who just wanted a freakin' dance class to take their child to. We went maybe once after that, then I conveniently found excuses to miss the next ~8 weeks. I should have demanded my money back but it was only $34 dollars so it didn't seem worth it to try to explain to the center why that was unacceptable.
However, we are in a Music Together class that is wonderful. The teacher takes it seriously but I don't think she is over the top. She does keep things moving along in that Kindergarten teacher sort of firm kindness, but I think that's probably a good thing with so many kids. She encourages us to include music in our daily lives, but that seems appropriate for people of any age, and there is no prodigy-making mentality at all. I feel she runs a great class.