I have not noticed this. On my team, people start showing up at 10. By 7, nearly everyone is gone. (Dinner starts at 6, so most people stay for that.) I'm at work later than that, but mostly because I only have a temporary apartment and have better food / coffee / computing equipment at work.
Ultimately, nobody monitors when you are in the office. All that matters is what you get done.
"On my team, people start showing up at 10. By 7, nearly everyone is gone. (Dinner starts at 6, so most people stay for that.)"
If they don't compensate by bring work home and continue doing it at home, than this is definitely a good thing.
"Ultimately, nobody monitors when you are in the office. All that matters is what you get done."
This is a better attitude than micromanagement, but it can still be abused if you are expected to do so much work that it forces you to work long hours, even if you are not explicitly told to work long hours to do it.
On the other hand, if you are skilled/smart enough to get done in a few hours what it would take someone less skilled to get done in 10, then you should (in theory) be better off under such a system -- except your managers could always compensate by giving you yet more work.
At a healthy workplace, the amount of work you're expected to do will fall within the range of what you are capable of doing and what you want to do.
I am getting the sense that Google is in fact such a place, and don't expect there are many deathmarches there. If there were, I doubt Google would be able to retain the caliber of talent it attracts.
Ultimately, nobody monitors when you are in the office. All that matters is what you get done.