What I love, is when a dad walks up in Bermuda shorts and flip flips and wants to know if he can help catch. "Sure, go ahead."
My DD speed and confidence has improved since I got catcher's gear. It seems she was always worried about me getting hurt, I got the hint from her Pitching Coach.
I know that many bucket sitters' enjoy the quality time spent catching their DD pitchers, but I think that most likely are holding back even if crazy mom/dad are wearing gear. There comes a time when DD is better off throwing to a real catcher, not a person who catches, and particularly not a person who catches sitting on a bucket.
Sure, it would be great to have a real catcher at every pitching lesson and practice but a lot of times that's not possible. I don't catch my daughter because I want to. (Don't get me wrong, I don't mind doing it.) I catch her because a lot of times there isn't another catcher available. Honestly, I'd rather be watching her pitch and talking to the instructor about what she's doing right and wrong and what she needs to work on. I can't watch and catch at the same time, I'm not that good.