Well the Boardwalk has the two late night options in Jellyrolls and Atlantic Dance Hall (I think that's what it's called), Port Orleans Riverside has a performer who is very popular.....depends what you are looking for really
Poly. Traders Sams and Tambu Lounge. You can also hop on the monorail and hit some of the other bars at the resorts. Rix Lounge at Coronado is also nice and their outside bar the sits on the water.
We actually like Yacht and Beach Club and then just walk over the bridge to the Boardwalk. It gives us the best of both worlds as we have Storm Along Bay to relax during the day and then a short walk to Jelly Rolls and Atlantic Dance Hall at night.
You could do drinks and bowling at Splitsville (I think they also have pool), or have drinks & dinner while watching a movie at the AMC. Raglan Rd has music on their patio on weekend nights, and there is the House of Blues. I think everything closes around 11 though?