Yup, there's nothing else to do except work, so people work longer hours. Actually, people here leave at least an hour earlier than when I worked at Apple. Overall, I think we interact with Asia a lot less (except for some specific teams). We don't need to stay late to get more overlap with them. At my last company, I had teams in Singapore and India to manage, so only having US people is much easier.
We do get 5 months a year where the weather is amazing. We're in that now.