I'm just going to be echoing what others said here largely, but for a more adult experience I'd aim to stay in the Disney Springs or Boardwalk resort areas
Disney Springs has the perk of being the larger of the two areas to end your night (Jock Lindsey's is a lot of fun), but the con of meaning you're taking buses everywhere
Boardwalk area is smaller, but very cut and you are within walking distance of two parks. Added bonus that one of the parks you're near is EPCOT, and the World Showcase is a great place to end your night at in the parks
On the topic of buses from the Swan and Dolphin, we often just walk from our resort to the Monorail station at EPCOT's entrance. You already get dropped off at the TTC these days, so it's the time it takes to walk there and take the monorail vs. the time to wait for the bus and take it to the TTC. You need park hopper to do this of course. If EPCOT is closed and you're coming back from MK you will need to take the bus though