I’ve been at Google for a little less than OP, and while I’m also considering leaving, my main reason is sort of the opposite:
I’m bored. The whole team is bored. It feels like we’re doing nothing, and have been doing nothing for years. I work under 25 hours a week, and the vast majority of time is spent in useless meetings or reading useless docs. My actual work is maybe 5 hours a week. What are we even getting paid for? No one knows. We just keep working on new projects nobody needs, then a few months later upper management shifts priorities and repeat. Seems like the only reason we have projects is to keep us busy. And oh, we’re always hiring. Apparently we’re understaffed. Some secretly call it a pyramid scheme.