I'm in Belgium and have been in the UK, Austria and France over the last two weeks. Had Switzerland and Paris left before heading home next week, but changed flights and am on the way home tomorrow from London, getting into Denver at 10 pm local time (incoming connection is Charlotte, so pretty far in front of the 12 midnight "kick start" of the ban).
While here, just washing hands more, using napkins to serve myself at hotel breakfast buffets, and a bit more sanitizer than I use at home. Having been on planes, trains, Ubers, in eye clinics, at restaurants, and staying in multiple hotels with people from all over the world - I'm surprised I haven't somehow gotten the mess. People don't shake hands or do the EU "air kiss" - they just greet and stand at around 4-6 feet away. Lots of masks, but most people here seem to go about their normal lives.
Now in the discussion with the wife on whether the kids need to go to their grandparents' houses this weekend when I get home, just in case. I told my wife I could send a message to the kids' schools telling them I just got back from Europe, and then watch the admin panic and give the kids the rest of the year off!