Something he doesn't touch on, but it's one reason I am willing to work on Saturdays: When the office is mostly empty, it's quiet and you are more productive.
For me it's not just quiet that helps. It's that doing things on my own time makes me much more relaxed about how I do it - want refactor that bit of code that works ok but you know it's ugly as hell? Want to try YUI3 when your whole site is written with YUI2 and you've got no great reason to upgrade? Want to redo that button with a background image that isn't quite antialiased properly? There are a whole slew of things that I just can't justify from a business point of view, but that have huge potential in terms of personal payoff. But once I'm on my own time I can sit down and try them out. Those that work out I take with confidence into businesss hours, those that don't are just a little self-development time.
Before anyone mentions it, I am somewhat internally conflicted in the sense that this kind of stuff should be built into the "on the clock" time. But it is how it is.
NB: the sad thing is - what he says about kids is absolutely true. With 2 kids now, even when I do get a little time to myself it is still laced with some guilt that I could be spending that with my family. And if I do put extra hours into to work it affects the whole family. So work stress translates directly to family stress.
