I'm no expert for Great America, only saying what I've witnessed the past two years. 2023 I was able to bang out a good chunk of rides but still missed Maxx Force, Viper, American Eagle, Demon, Batman, Flash, Superman, Dark Knight, etc. I skipped most of those, though, because they were carrying a 45+ minute wait all day and they're rides I've done plenty of times at other Six Flags parks, so no big deal. 2024 was more or less the same, but I prioritized Maxx Force, Viper, and American Eagle as they're unique to the park and I hadn't ridden them.
I'm 2.5-3 hours south of the park. Even with a season pass both years I only went once each year. For context, I went to Great Adventure multiple times both years (we visit family in Jersey 3-5 times annually) and was able to make those shorter, half-day or less visits and I was still able to bang out nearly the entire park each time, including MULTIPLE laps on star attractions like Toro, Jersey Devil, and Ka. Great America I've spent the entire day at the park and hardly made a dent both times.
Great America has potential and has a great lineup of coasters and flats, but operations have soured me to the park. I'd much rather drive the 2-ish hours to Six Flags St Louis and go buckwild there all day like I did last year. Mr. Freeze and The Boss are more than worth the trip alone and, hot take, are better rides than 90% of what Great America offers. Yeah, I said it. Goliath and, to a lesser extent, Maxx Force, are the only truly standout attractions at Great America. The other rides are plenty fun but kinda boilerplate since they have so many clones.