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Completely agree! Too good, too detailed, too enthralling - I've never encountered a novel like it, although I could see why some might be turned away by the maximalist prose and seemingly endless sentences. It did take me a while to adapt to DFW's style but once you're there, it's so rewarding.
I bought a stack of cheap Jorge Borges fictions not long ago, I think they'll make a good stopgap between IJ and Gravity's Rainbow.
Yes! The addictive nature of a book about addiction. It's too good. And the circular structure of the book - the end at the beginning loop of it - really invites infinte rereads.
I dunno what I'd recommend next, but I think you're right about giving your brain a break before you leap into GR. Something short, whatever it is!