As an aside - it was honestly really hard to tell in person. If you asked me before the first parade, I would've said it seemed undersold - lines were pretty short, and I got a lot done right away. After the first parade, it felt like a typically busy DCA day. But if I had to guess (based on my own limited experience), it felt gently lighter than it did when I was there two years ago. (It seemed like all of the ride lines were short all night, which wasn't the case two years ago. Plus, I managed to get most everything I wanted to do done relatively early - I don't know that I needed the full five hours like I did two years ago.)
I wouldn't be afraid to pick that night again in the future. (I feel like they probably over-priced it more than anything else.)