I always bring a fanny pack/belt bag on my park trips and its honestly the best!! It forces you to pack light, so it might not work for everyone, but i've never had an issue. My packing list isn't super weird, but i always bring -
1) some cash so i don't always need to use cards
2) i make rice crispy treats at home or a similar sweet treat so when i have a sweet tooth i can just pull something out of my bag rather than spending a ton on an expensive disney version. I still buy a few treats, but i have a wicked sweet tooth and would waste so much money on treats at disney if i didnt bring a few. plus then i control the portion sizes and dont feel like i have to finish it.
3) a comb (my hair is long and turns into a rats nest after a few rides)
4) peppermint foot lotion/cooling foot lotion and some at home pedi stuff. This one (obviously) doesnt go to the park with me, but i always find that my feet are dirty, swollen, and sore at the end of the day. a nice soak with epsom salts and some cooling/soothing lotion helps make my feetsies feel great!
5) a few spare ziplock bags