As a recent grad working at Google, it's probably a lot like being a janitor at NASA. Some really cool stuff is going on there, but you're still just a janitor.
Google has a couple interesting projects, but most people are doing the grunt work associated with keeping a large corporation running.
I'd imagine the experience, even within the company, would depend on the position.
Yes, I thought Google was an obvious one but didn't want to bias the question.