
Your mileage will vary significantly in terms of work-life balance. There are quite a few people who coast; they do enough work to stay relevant, but seem more focused on the "lifestyle" at Facebook. For many people, it is very intense. Product managers in particular seem to have the worst work-life balance (6:30 AM start, emails until 11:00 PM) due to the insane number of people and connections that have to be in alignment to get things done.
Never worked harder, but also never worked smarter. People have flexible schedules depending on their needs, and weekends, for me at least, almost never require me to work. I work my butt off when I am at work and on the shuttle, but can almost always assume I'm done when I get to my front door.
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