Mortimer Adler's How to Read a Book provides a decent framework for dealing with the variety of books out there. There are also tools like Polar[1] that provide an easy way to do incremental reading[2] which may help when attacking a book piece by relevant piece.
With my last book, I expanded on a couple areas in a new edition and I feel better about the overall information density. But in the original, I definitely felt I was padding here and there to hit a page target.
I like the idea, not because I dislike reading, but because it's handy to have an "idea map" of a book. The ToC is ostensibly that, but it's hard to figure out what their points are from the titles alone.
Wish I could remember what the company was called, but whatever. Haven't used them myself, but it struck me as a neat concept.