Being in my 20s and have less experience than most of you, I must say that I'm not very fond of doing katas. I would rather do tournament trainings. But as I step up in belts, I have to be a good example of lower belts. This is what keeps me learning katas(sometimes

). Doing katas are very good to learn the basic form of techniques and also can be good trainings.
I think everyone has experiened when your instructor starts talking when you are still in good zenkutsu dachi or koukutsu dachi.. it's pretty hard to maintain the form for a long time!