I have a family member that buys a pass and goes every day, every year.
But for me,
The crowds, while it is some good people watching, I can't stand people that are completely oblivious to their surroundings and just cut you off or bump into you, or maybe they are just rude lol
The smells, yep... most are not very pleasant, especially when 95 degrees outside. Something along the lines of a cross between a dumpster and that stale beer stinch. It's probably not too bad if you go on opening day or in the morning, and it's also probably less trashy/dirty in general.
The food, I agree a Fletcher's corn dog with mustard is a must. It truly is amazing how most everything else seems to taste exactly the same and is super expensive.
The rodeo and some of the exhibits are pretty cool.
https://bigtex.com
Geez, with all this reminiscing, I think I may have to go this year. Lol