While I am a bit on the ancient side, I still remember much of a book's content. Sometimes, if rereading, I know before turning a page what the first words on it will be.
I derive pleasure and comfort from familiar characters etc. but would rather it was a new to me book.
Music to me is not all about the words, and the pleasure derived seldom by me has much to do with the lyrics. Plus I have never been able to carry a tune, even in my head, so often a song or instrumental is not totally familiar even if I have heard it 500 times.
I do not feel sorry for rereaders, if it is enjoyable then by all means why not, and it sure must save a few bucks
Lucky for me there are many many books that I haven't read yet, and that I really, really want to read. If there wasn't I would perhaps envy those who thoroughly enjoy rereading and rewatching.
I don't even pity those who choose not to read. They seem just as happy with their own methods of entertainment. Not my place to judge otherwise.