Earlier quoted context omitted.
It's funny, as a kid I can remember thinking: "Right, everything has to go in the main function unless absolutely necessary, it will just be easier to read that way." Nowadays, it's the exact opposite!
My code changed in a similar way, however I recently devolved. I've mostly worked with higher level languages, and recently delved back into C. I had forgotten what a complete pain in the ass it is to pass complex data structures around between functions. I'm a bit ashamed to admit my functions got pretty damn beefy real quick.
Don't worry, you can do this in C# or Python as well. Just structure your small, gradually growing proof-of-concept and soon-to-be-finished-product program correctly. No classes! Or at the very least a few monolithic ones, which cannot be instantiated. Use static methods whenever possible. I have never ever ever done this.
(I am getting ready to write an essay titled "Confessions of a Shitty Programmer").