i can honestly say i never used Auto ISO since i have gone digital.
Opinions are divided on this, but imho auto iso is one of the primary advancements of the digital age, with today's cameras a couple of stops don't show (much) and you can either use m (though Canon lacks ec on m) or Av for changing lighting conditions - but for the latter you either need a 5d3/6d/1dx or Magic Lantern to set the min. shutter speed, or the Canon algorithm will go to low to shoot anything moving.
I have to agree with Lichtgestalt.
I think Auto ISO is for the lazy people or people that don't know anything about photography or video. Even with "today's" cameras... how do you let a camera's logic decide how much noise is acceptable in your pictures or video?
In my humble opinion, its like auto-white balance, you know you're a novice if you're still using auto-white balance.
This is seriously just a troll post. Only a novice in digital thinks that you have to set your white balance. Shoot RAW and you don't even have to think about it until PP.
And Auto-ISO is helpful when the light conditions change drastically in a short amount of time and you don't want to miss some good opportunities for good shots.
As a 6D owner, I think the AF points is the only thing that I would change. One cross-type is pretty ridiculous. Even the T4i, announced in June 2012, had 9 cross-type AF points! There's no way the 6DII would omit a new AF system. But I agree it will be 2-3 years until it shows up. It has the IQ of the 5DIII and you save a lot more money. IQ is a top priority.