Yes I have, although not in and out of houses, but we did visit each other a lot!
During secondary school years, a group from a musical theatre group I went to - we had group texts/emails and would meet up as a group constantly. I'm still in touch with a couple of them but our group didn't really survive us all going off to uni.
Also school friends - would spend hours on the phone/regular sleepovers. Didn't survive a big fallout aged 18, I think two of the others are still friends.
When I got together with DS1's dad, he was really extroverted and pretty much hated to be alone so there was a core group of us that would constantly hang out. I got on with his friends but they stayed loyal to him when we split so I lost touch with them.
DH has a uni group that he still sees although they are a bit more fragmented now and unfortunately one died. Some others are married (not an issue) and everyone lives spread out, so there aren't really face to face meet upd. He used to play games online with them all but I think doesn't any more.
When I had DS1 as a toddler I met a group through the local La Leche League who I got really close to, we did spend a lot of time together because toddlers = need for social contact or you go mad! I moved abroad and lost touch with all but two of them.
On moving abroad I started going to this English speakers' expat brunch thing and met people through that, group whatsapp chats, regular girls nights out/in. It's different being abroad without family, so people support each other as a kind of adopted family.
I've always liked socialising in groups.