Ah, blow me (and I say that in the friendliest way possible :). I'm of the personal (key word) opinion that Vonnegut NEEDS to be on anybody's learning list. The point, however, is that people who love to learn need nothing more than a heightened sense of curiosity, not some bullshit reading list that attempts to validate how smart they are.
I read Vonnegut, too. I don't think I have learned anything "deep" from his books, but I love them nonetheless. Art is art. Science is science. Both are needed.