Biggest example of this is to go to any news site or blog, and scroll through in a browser (without adblock if you're feeling frisky). How long did you have to scroll, and how dense was the text?

Then open a TUI browser like Lynx and go to the same page. Now look at how much text there really was. Usually it will be about a page or so without the need to scroll at all.

Doing this opened my eyes to just how monumentally bad modern web design has gotten at conveying information.