My first Aikido teacher expected the senior student to sit in seiza immediately after class and wait for him to hand them his hakama. Then it had better be done by the time he got done changing and you better still be sitting in seiza where he handed it to you with both hands still holding the thing. He'd take it, feel it to see if it was flat enough and either put it on his desk, or flop it open and tell you to do it again if he could feel any bulges.
That's stupid. Really stupid, although I do fold a mighty tidy hakama now.
I have offered to fold people's hakama, but mostly as a convenience or a show of respect, sort of like saying, "Hey, you're busy and I know you need to get going, so I can fold that for you..." It's similar to in my sword school when I've offered to clean my teacher's shinken after class because I knew he was in a hurry. It's not grovelling, it's just being polite.