I feel very fortunate indeed everynight when I take the kids to bed. I feel fortunate that I do not have any work stress to take my focus off my kids. No morning meetings to worry about, no important deadlines, business trips, etc etc to think about. My full focus and attention is on and for them.
Singing, reading and chatting with the kids is much more fun than if my mind was cluttered with other stuff ie. wondering elsewhere or is full of worry about the next day. Of course one could say that you should separate work from home by worrying about work only at work but its easier said than done of course.
Balancing work with family becomes very important after the kids come along. I'm sure even the men struggle with this. I personally feel that if anyone would rather spend more time working than with the family (taking money out of the equation) than something must be quite wrong.
Its really not easy to balance work with family. I'm glad I don't have to do it!