I’ll give my counter-anecdote. I have made three close friends at work who I frequently talk to about relationship issues, etc, and would happily help them move a couch if they asked. One of them is currently my roommate. I’m 41, so these things can happen as an adult too. It might be different if I had my own family though.
I've just said this earlier in another comment, but I've never had what I'd consider true friendships come out from work acquaintances. I just don't consider "I have fun with you sometimes" to be friendship, and there's exactly 0 people from all the places I've worked at I would feel comfortable say, calling at 3am if I ever felt depressed. That's friendship in my eyes, and a company retreat would never bring that kind of intimacy that's for me a requirement to actual friendship.
Now there are definitely people I would work with again without hesitation, and I'd grab a drink any time with most of my old colleagues.