I'm happy you got to experience so much, especially meeting up with friends! :)
I booked strategically when I went to Japan to avoid GW, I guess it must be crowded everywhere now.
Tokyo was awesome but I feel almost bad to say it's the least impressive place in Japan I've been yet (!) Just so many tourists around and so crowded it doesn't even feel like Japan sometimes! But nontheless I had a good time there, especially meeting our colleagues in Ueno Zoo :)
Hope you have a great GW vacation! ^-^