Alright. I've read and reread the series multiple times. I get bored. Then I've found that if I read them with particular WAGs/lenses in mind, the rereads get more interesting.
One of the earliest WAGs on the forum that spanned the entire series was Ms. Duck's theory that Molly TT's into the past to ascend and become Mab. She was fairly close in her guess as far as Molly has so far became Winter Lady, though not via Time Travel. So, obviously Ms. Duck would read the series looking for clues that perhaps Molly would be entwined with Winter, Winter's rulers, and be the Mab we encounter during the books.
Similar to her series but with a different character at the center of the theory, I had Murphy assuming that position, like her I did the same thing. I looked for links to Winter, potential foreshadowing, irony, similarities, etc when rereading the books. It adds that extra something to the books when I reread them. Also, I've reread the books where there is a time loop that begins near the start of the series. And, there is a future that has occured and is occurring relative to the book's present that has already taken place to some extent. Anyone who believes Harry TT's into the past necessarily would believe there is a future existent relative to the past traveled to.
Anyways, what WAG's (lenses), do you like to reread the books through (with). Please don't be condescending in responses.
I should also mention there is a pertinent WOJ from Jim specifically about Rereads and how by the time we get to the end, we will need to reread, and things will, when we do, look a different and/or have more meaning. (paraphrasing)