I can confidently say that, yes, reading helps a lot. My mental model has shifted a bit that words are cheap (printing -> writing -> typing -> generating) and that we should accept there is something like high quality text.
I haven't really been a reader, but I can definitely notice when a book/text is "hard". I'm currently reading the old testament, and I understand very little (even the oxford one that has a lot of annotations is hard for me). I like this, because its a measurement of what I don't know (if that makes sense).
I tried reading Proust's In Search Of Lost Time some time ago, in which the first 10-20 pages are about a guy lying in his bed at night and observing his own thoughts (roughly). And I quickly realised how I was reading the words and even sentences, but couldn't grasp the meaning of them - I couldn't produce a "mental model" or image of what it was about. It was a very humbling experience.
I used to be an avid reader as a child, even as a teenager. That was a long time ago. I'm looking forward to that time when I will have the mental capacity to read long prose again.
I haven't really been a reader, but I can definitely notice when a book/text is "hard". I'm currently reading the old testament, and I understand very little (even the oxford one that has a lot of annotations is hard for me). I like this, because its a measurement of what I don't know (if that makes sense).