This is such at odds with everything I've heard and read about Google, I'd like to know if there's a typo in that sentence, and if not, how to you square the wider perception with your perception?
Of course, I originally worked for Amazon.com, so my baseline for a good work/life balance may be skewed, and I don't work in Mountain View, so I can't speak to the culture at headquarters.
Disclaimer: I work at Google, pretty much 9 to 5. But it's a huge company and I'm sure you can find pathological microcultures somewhere.
Maintaining healthy work-life balance has also been pushed by the company fairly heavily in my time here. Yes, there are workaholics, but in my experience they are not the norm. Moreover, it doesn't seem to give them an edge over those of us who prefer a saner schedule.
No doubt you've heard about dinner cafes opening late to keep employees at their desks, but the reality is that a lot of people's productivity slows down from 5-6 anyway (that was ping pong hour for me). Go! cafe is open all day, and lots of people grab a sandwich before skedaddling at 5pm sharp.
Maybe there's more pressure at some teams to put in more hours. I have no data on that.
I think overall vacation benefits, hours, and pa/maternity leave are slightly better, but I'm not certain.