HI!
I went solo last year! I was there for the rides as well. If only doing rides is your goal you can do almost the entire park with minimal waits.
You’ll be able to enter the park at 4pm, so you can start knocking out rides before the party even starts.
Last year Tron was BGs only. The spots went instantly. They were released at 6pm. I used the BG1 app to get a spot. They BGs were all gone within a minute!
Space Mountain was a habitual 30 minute wait…
The rides that had 30 - 40 minute waits all night (the longest) were Haunted Mansion, 7DMT and Space Mt.
I arrived before 3pm to be at the front of the RD crowd.
I did watch the all the MNSSHP shows, met Jack & Sally (first person in queue!) and a couple other characters. Even doing these “side quests” I still managed to do Country Bears (before party) and then all of Tomorrowland and Fantasyland Haunted Mansion (3 times) and Pirates during the party. I chose not to do BTMRR, Jungle Cruise and Splash was under construction for TBA conversion.
I found food lines to be very long and annoying. Once I started using mobile order it got better. I wound up just eating way too much free candy & gave myself a stomach ache. I stayed until well after 1am and left the parks in my Uber after 2am.
It was a blast!
Here’s my Trip Report. I’ve bookmarked where I arrived for the party