I understand what you are saying about little league players wearing them(because quite honestly the games are light and not terribly challenging)
With that said,I have no problem with the High school or college/pro catcher wearing them.I personally wear them.
-When you are working bullpens,its a great thing to have.
-It doesnt slow a pop time if you throw and use proper footwork
-It doesnt make you lazy,chances are you were already lazy and have poor work habits if you are "lazy" behind the plate.
For little league players,I agree 100% they shouldnt use them,but at the upper levels,its helpful in not relying 100% on your knees.