I care about language a lot (feel free to go back through my comments from the past few days; you'll see a number of comments I made in debate about two different forms of a specific idiom because I have strong descriptivist opinions), but I genuinely struggle to identify whether text is AI generated. Maybe you're using "heavily" as the load-bearing part of your claim (sorry, I couldn't resist, another example of me finding language fun!), but I think you might be assuming a bit too much about how similarly others experience the world to you. A huge part of why I care so much about language is because I've always had to put a lot of effort into learning how to communicate well with others, and that ends up causing me to think and read a lot about stuff like how people use certain words in certain contexts to mean different things; the reason I care is pretty much the same as the reason I struggle with recognizing AI content.