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Because Dick was such a respected author those who made movies based on his novels/stories did a pretty good job of staying as true to the book as they possibly could. Reading the books beforehand also gives you a better understanding of the characters. Since they are under time constraints, movies are usually way too vague and shallow about them, which is a shame, because Dick didn't really write vague or shallow character. Ever.
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I think in some cases it's necessary to also read the book beforehand or otherwise, like Blade Runner for instance, I would've of never understood the significance of Deckard's question about Rachel's owl being real or not without reading the book.
Moreover the book helped nme understand why it was constantly raining in the movie, although it's one of the things that subconsciously registers with you, it's more meaningful once you know why it's happening.