I worked at Microsoft for nearly 14 years. I had the privilege of working on 4 very different teams (microBrowser, Palladium/Bitlocker, Robotics, Midori)

So in many respects it was like working at 4 different companies, in that respect I avoided the pigeonhole trap (which certainly also applies when you do move companies) but over time I accumulated corporate cruft which ended up dragging me down. Moving to a new company allows you to reset that.