Is it terrible I have a favorite room for each land?
Main Street: Central Plaza! I don't know, it just feels like the true "hub" of Main Street to me. And it's so fun to walk down or just sit, and it was one of my favorite hangouts in OVMK.
Adventureland: Besides the Pirates Lobby (I was ALWAYS in the Pirates lobby), definitely the Forbidden Temple. Mostly out of nostalgia, a friend and I used to always end up in this room sooner or later.
Fantasyland: SPELL ROOM YES. This is probably my favorite place in the game, actually. It's just so fun.
Tomorrowland: Tomorrowland Hub without a doubt. I don't know, that room is just so... amazing and detailed and FUN to be in.
Frontierland: BIG THUNDER MOUNTAIN. THE MAZE.
New Orleans Square: Blue Bayou! I don't know, sitting down and pretending to enjoy a nice dinner with friends is just so cool - and it's in a public room? Mm, yes~