I agree. While I enjoy my privacy and quiet time too much to share a room, I know lots of people who rent room only Air BnB's and use a couch surfing ap. It's a fairly popular thing among millennials. I actually know young couple that hosts people on the couch surfing ap on a frequent basis and they've only had one experience where the person was strange, but harmless.
to the OP, please check back here from time to time. There are many solo travelers on this board that will be at WDW during the time you are planning to go who may be willing to meet up. I do remember one of the ladies that posts here frequently was looking for someone to share last year, so it's not absolutely unheard of on this board.