You can get the same no-rush-hour benefit by going the opposite direction; I show up to the office at 7am, and I'm out the door by 330 at the latest. There's somebody else in my office that I've only ever overlapped with for a couple hours at a time because he basically never shows up before noon. He used to give me a hard time about how early I left every day until I explained that I was showing up to the office an hour or two after he went to sleep each night.

I'm in California and I try to get meetings scheduled for the late morning or early afternoon. 11am meetings are totally reasonable for anybody on the west coast, and it's not too hard to convince people in (for example) New York to not schedule meetings for before 10am their time. On the rare occasion that I need to make a 6am phone call with somebody who's a real go-getter on the east cast, I'll just bite the bullet and show up at 6, and then take off around 2.

On the other hand, I used to work in a bakery, so waking up at 7am is still sort of like sleeping in for me. But there's nothing like finishing your day at 330; I love it.