My wife is expecting our first child soon and one thing it has really done is change my perspective. I've actually become a more dedicated employee and have also realized the glass and rubber ball metaphors.
There's bugs that have to be fixed right now and projects that have to be completed on time -- but there's also a personal life.
I'm no longer killing myself because of some minor bug that can wait, but at the same time I'm finding that when I am "on," I'm actually "on" instead of the half-on all the time.
It's been a life changing experience and it's very hard to describe in an understandable way to people who haven't gone through it, but this article is coming close.