Don't they have the right? I mean, a developer that's talented enough to attract attention from Google then surely they'd be smart enough to know what constitutes working 'too much.'

I don't think Google exploits its workers anymore than they exploit themselves. If you think you've worked too much, then go home? If they ask you "hey, do you want to pull a 80-hour week this week?" why should you say anything other than: "fuuuuck no"

Going even further, it wouldn't shock me if at least a subset of Google programmers go home and -- sit down and start programming something else. If they were going to do it anyways, and Google's going to pay them their dues, hell, I'm all about it.

Eat, sleep, code, get paid, repeat.