Oh man, is that something that changed in the last few years? One thing I always liked about the Mountain View campus is that every door, no matter how minor, had a badge reader on it, so you could always take the most direct path between two possible points.

At the same time, there were a lot of stories on the internal social network about people walking in behind them, so I kind of get why the policy might have been changed. I would have been one of the people mad about it!

(I posted one of these following-me-in stories once; I unlocked the door and someone pushed me out of the way to go into the office ahead of me, and I didn't see their badge. I tracked down security, they reviewed the tapes, and it turned out to be a legitimate coworker. I shared the story with the angle "this is what you should do if someone follows you in", but I got panned for not doing enough to protect my coworkers. I probably didn't post this, but my takeaway was "if your security depends on me being able to beat someone up that is larger than me, you're already dead". One of the few times the internal social media hive mind turned against me, and it was really really weird.)