I'm not going to reread
Lord of the Flies , either.
That said, I think I have a far greater appreciation for beautiful prose now than I did in my salad days and that for me is the benefit in rereading. The story doesn't change and I remembered this one well enough (not surprising!), but my level of discernment has changed for the better. Another example is
Tender is the Night, a book club selection a few years ago. I was bowled away; on rereading it became one of the best books I'd ever read.