You won't ever catch me griping about the time I spend with my children. I love every minute of driving them to their various extracurricular practices and watching them develop their talents and skills. Not only that, I've gotten involved with their sports and musical events from an administrative angle which has helped me expand my own talents and skills, and even literally paid off when I got hired as the school musical director ;-).
I have friends, who, when they became parents, became astonished at how fast kids grew. This lead them to form a business in used childrens' clothing. A store opened, franchises were created, they quite their day jobs, and eventually sold the chain. People who really "Get into it" are rewarded one way or another.
I am assuming that for the most part, on here, we are all writng to and about "good" parents. But we all see bad ones, too, elsewhere.