Pretty much every moderate and deluxe resorts have a lounge and some of the nicer restaurants have lounges as well. Disney Springs has a lot of options like the Coke rooftop and Jock Lindsey’s Hanger Bar. Unfortunately, Jellyrolls at the Boardwalk is still closed with no opening date in sight. Just to let you know though, kids are allowed pretty much everywhere in Disney, including bars/lounges, aside from a few places that aren’t open right now.
If you’re wanting a more adult experience, you might want to head off property. There’s a really cool place near UCF called Cloak & Blaster if you are geeky at all.