Have had and still have multiple experiences with both. Yes, of course, they are different. I can not go regularly because my schedule does not allow it but I have always gone when the opportunity allows for it. As mentioned, the boys are easy, they don't care what you do as it doesn't change what they are going to do or behave, generally. When they are practicing, they are more focused on practice and playing and don't think about parents. Girls, on the other hand... From my experience, girls have a different motivation. Parents force them to be there, some don't want to do PE and this is an easy way to slack, they slack at practice and don't want parents to see that, etc., etc. However, there are also many that take it serious. Mine liked for me to see and provide feedback on different things that we worked on or she worked on with club or private coach so it was a interactive practice for her when I am there. High School provides a different look against different styles that allow players to do different things and work on creativity, etc. When and where I grew up as a kid, schools didn't have High School sports so I find it entertaining that in the US, people think High School soccer is bad. I have experienced no down side for my players and used it to benefit my players. In my experience, the parents who did the most complaining, had the least amount of experience in the sport and were just repeating bullet points from other parents or sources.
In short, if your kid doesn't want you there, it may be because they don't want you to see them not working. Lots and lots of girl gossip. This was not a problem for boys.
