How do you think you'd rate it today, already knowing about all those things? It's sitting on my table in my to read stack but I haven't managed to get to it yet.
My (potentially unpopular) feeling about GEB is that it's a book that explores some very interesting areas but that doesn't say all that much of interest itself. Reading it I felt like different sections could be put into two categories: (good and somewhat romantic) exposition about something interesting, and observations that seem profound until you think about them and realize that they're stupid (e.g. Hofstadter spends some time discussing how a Bach piece that ends up one semitone higher than it starts [and can therefore be repeated to form an infinite ascension] embodies self-referentiality and that this is the critical component of self-awareness, and that therefore the two are connected; of course, this is all just more-or-less meaningless fluff).
To give an alternate opinion. You should read through the first dialogue and the following chapter, then decide for yourself. Maybe skip ahead a bit. I read half of it sitting in a library when I didn't really have time to read it, it presented ideas I hadn't thought before. I hadn't heard of figure and ground, at least not generalized, so I enjoyed noticing that my conversations jumped around the subject rather than being on the subject. I also hadn't heard about recursion before, so...
If the writing engages you then you and presents interesting ideas, to you, in a non-obvious way, then it is worth reading.
