Huh, it's been exactly the opposite for me. Whereas before I could glance around the office, see who didn't have headphones on, and initiate a quick discussion

Huh, it's been exactly the opposite for me. Whereas before I could glance around the office, see who didn't have headphones on, and initiate a quick discussion when appropriate, I now need to actually schedule a Zoom meeting on the calendar. (This isn't a blanket argument against work from home—people have different prioritizes.)