I've attended the weddings of multiple friends from my first job. I'm still in touch with 4-5 people from my second job. I haven't spoken to anyone from my team at Google since the day I left. I had good, cordial relationships with all of them, but it was also incredibly impersonal. I don't even recall learning anything about anyone's spouse, for instance.
I remember when I got my first job I was extremely social and would try to make friends with anyone. But now that I'm on my nth job I don't feel the need to socialize as much and would prefer to put in my work hours and move on with my life.
I don't think it's a good thing though. Middle aged men especially, I think, generally could do with a wider circle of acquaintances.
I try to keep in touch with a lot of my ex coworkers every 6 months.
Some of them are actually very keen to catch up, years after the job.
I'm friends with people who I was not very friendly with on the job 18 months after I've left the place, after sending them a text message saying "how's it going."
At Facebook I was part of a startup acquisition. Those members were battle buddies. Facebook also had a cultural value that you should bring your authentic self to work, which I think led to people bonding better. That or it’s because Facebook threw lots of parties with inappropriate amounts of alcohol
“Bring The Best 90% Of Your Self To Work”
Honestly, we all have a part of ourselves we should leave at home.
This may be because I'm a middling-social person; I'm an introvert by nature, and don't mind long stretches of alone time, but I can also hold a conversation about non-work topics. All it really takes is two extroverts (or at least reasonably friendly people) on the team to change the dynamic.
I think a lot of people just wanted to put in their hours and get home to their families. I love pool but never played with anyone on the table one floor down because it just wasn't a make-friends environment. I think I shot the shit with someone when I got into work a handful of times in the more-than-a-year that I worked there. Huge reason I left.
This isn't even coming from a social person. I prefer WFH. I don't particularly like going out. However, if I'm gonna be forced to be around people I'd at least like it to be pleasant.