Yes, I think so. Apart from all the photos (and moon rock he brought back), they left retroreflectors (mirrors) on the moon. Today you can fire a laser up to the moon hit the retrorelector and time the amount of time it takes for the laser beam to return. This wouldn’t be possible if no one was on the moon to leave them there. It is pretty indisputable proof.
After Neil Armstrong died people said he would tell really bad jokes about the moon. When nobody laughed, he would say “I guess you had to be there”. Not sure if that is true or not, but it should be.