Yes. Coaches really push them way too hard in my opinion and leagues have had to introduce pitch count limits with mandatory rest. I've heard stories of kids needing elbow surgery as young as 12-13. I tell my kids if they're throwing it harder than ~85% they're throwing too hard.
Oh, that's great that they force rest. I wasn't overused, but hurt my arm pitching when I was playing and it sucked. I definitely saw some kids getting way too much time on the mound (for their arms' sake) when we had tourneys.