I love how everyone is double-spacing after their periods now. Its like a blast from the past.
You're pretty unlikely to find anything where I don't do that. Old habits die hard and, as many here have pointed out, if you learned to type when typewriters and word processors were still a thing, it's pretty standard behaviour.

I did, as I commented earlier. I actually can remember back to a time when I was debating whether to use single or double spaces in a report and then someone telling me that you don't need to double space anymore. Not sure of the exact date or other details surrounding that though. I haven't been using double space since that time.