I agree about short feedback loops, but this was there long before LLMs, and got me into programming initially.

I love that I could compile my program and try it without needing to check it with a teacher or superior. It cost literally nothing to try, and if it failed the computer would tell you it was wrong.

In a sense you are constantly bouncing off of reality (or the limits of the compiler) and that allows you to learn really quickly by experiment. LLMs with their tendency to hallucinate or just provide you with the solution seem like they could be both a blessing and a curse (for learning).