I've learnt more since the advent of LLMs than I did in the 10 years prior. And it's not just me; that is most people's experience with LLMs. But most of those people would also concur with your apocalyptic thinking. AI is the apocalypse for thinking, except for me, only I am smart enough and experienced enough to maintain my cognitive ability while using LLMs.
As an educator (of working professionals / continuing education), I see first-hand the range of AI use amongst the population (and even my population is not a representative sample, as it's people who are intrinsically geared towards being interested in building with AI), but your experience unfortunately probably reflects around ~30% of the population. The other third I'm slightly less hopeful about, but they might have a chance merely surviving, and the latter third I'd place in the 'full cognitive offloading / total abdication of all thinking and learning to machines' - for them, as the kids say: ngmi. Even within me as a single individual, I can sense the times AI is so tempting to offload cognition, and other times where it has been like a 100x speedup in my own innate skills and abilities. The future has come on quick, and we are barely getting to adjust healthily to it.
Hey you forgot /s at the end.
... You are absolutely right!
The problem is that if you take away the LLM, all of a sudden you can't do any of the things you "learned". It's confusing familiarity with understanding.