That article both spoke to me and seemed foreign; I've lived alone for all but two years of the last 20 (since high school), and I do "spread out" in many of the ways it describes. But, when I do get to temporarily "live with" someone---when I'm home at my parents' house, when I'm sharing a hotel room at a conference, when I'm visiting friends for a few days---my experience is totally opposite the article. I look forward to having the temporary roommate, I sleep with the door open at my parents', I prefer the living room couch to a tucked-away guest bedroom at my friends' houses, because I
like being aware of and part of the bustle of everyone living there.
In contrast, my friends who are married or living together treat those temporary thrown-together situations as maximally distasteful. They want a separate private room, they disdain sharing rooms at conferences unless they have to. When I've asked about it, I'm often given a line about how "when you're older" you want your private time, but many of them aren't that much older than me (and a few are younger), so that's always rung hollow. I wonder if it's just that this is their time to have a "Day of Chad"? ;)