Good post and I have had my 920 for 2 days now. I have just like you, been on ALL the major os's (except blackberry 10). I was waiting on blackberry 10 and after I got over the "that is cool" I kind of saw the issues there were having and after looking at the whole picture, I had the playbook flashbacks; where I put paid $500 and it was ok, nothing big.
So now I am back, even jumped carriers, and wow. WP8 is amazing and really, I don't see any "oh I wished it did this". I love live tiles, the new live tiles and updates. Love not using the facebook app and just how WP8 runs. With the new hardware, the os is so fast it makes my head spin.
Now I just lied, I did find where I want custom notifications for text and email, that is a hole, but not a killer hole in the os as ringtones are more important but I can live with it you know? This lumia 920 is a beast and I am never going to touch android again and that also goes for ios.