Every time I post about LLMs being useless (because they can't think) people reply with "but it works for me".

No, it doesn't work for you. That's the point.

You can't know when it's lying or being subtly wrong, unless you do the work yourself to research if what it's saying is actually correct.

If you say "I always check" why use the LLM in the first place? Now it's double the work. (Of course no one actually does the checking, they only say they do.)