I've noticed the cognitive damage! Not at the time, but later, when I reviewed something I'd done and realized it showed impaired cognition. (It's glaringly obvious if you're a writer who starts each daily work session by revising what you did the day before.)
I think we've probably all noticed a deterioration in road users since 2020, too. More aggressive/heedless driving, etc.
https://forall.social/@ABScientist/113184952208995908