In that time, I started out on an underappreciated starter project, did a hackathon for Hangout, filed some patents for that work, did 20% work for an yet to be announced project, and now building out a completely new yet to be announced product.
Google is a place that really allows you to find something that interests you and encourages you to do that. Internally, people are always looking for people to put in 20% work on their projects; so if you come across something that interests you, nobody is there to stop you.
Personally, if I was only to work on one project for my entire tenure, I'd be bored out of my mind and be looking elsewhere for opportunities. At Google, I can feed by project-ADD within.
One thing you learn at Google is that it really humbles you. You really are working with really intelligent people and you need to have some faith in your fellow coworker. Everyone has something to contribute and you can learn even more than you can teach/preach. Much of the issues with this former Googler is that he may have had some good/interesting ideas but he failed at garnering support. It doesn't help when he publicly on a global mailing list dismissed coworkers that have a significant amount of experience and real world accomplishments in the field that he was advocating.