Haha, I don't know about Discord, but I used to live on vBulletin forums many years ago. Nothing else in social media has managed to recapture the magic of those days.
I don't have any juicy negative experiences to recount - I'm just leaving room for improvement - there was the steep learning curve, and dealing with bandwidth issues was frustrating until I got over that hump.
OMG! CELLAR.ORG! That's what it was and it's still active! I'm going to have to check t out. I wonder if I can remember my username and password...
My thing was Tolkien forums, hehe.