Thinking through this thread has been interesting. I started with..."I'd never want to go to wdw alone" and then started thinking.
It's true...I've always gone to wdw with my DW--it was her obsession (her parents took her when she was 5 and she hadn't found anyone willing to go with her since) which I grudgingly agreed to endure until I (quickly) learned to love it. So, we have a great time being there together.
But, she travels for work so we spend a lot of time apart normally. And, I did a reasonable amount of traveling on my own in my 20s, so, I'm fairly good at striking out and going somewhere. I went to Portugal by myself on short notice a few years ago and had a good time, but, I did notice the sense of aloneness that can develop whenever things go wrong.
So, for now, I doubt I'd go to wdw alone, but, I might try it someday.