Well, I think to most of us, language is extremely closely tied to our actual thoughts. So verbal expression is at the very least part of the thinking process.
I don't know, maybe I'm just not faced with the abuses of LLMs the way you are? I don't regularly experience people who clearly skipped the effort and just let an LLM do the thinking for them. (It happens, and it's problematic, but at in my experience it's rare.) And it's possible that it's just because my bubble haven't caught up yet.