I'm the same way. I'm not sad the book is over, but for some reason it's hard to just get into something new.

No, I don't feel this way, but I guess I must have at some point in the past because I know exactly what you're describing and what it feels like. These days I mostly just feel annoyed when I finish a good book, because I know from experience that it can take me a while to select a new book and get wrapped back up into it. Lately I've been known to just start reading the same book over again, just so I don't have to think about what to read next.