^^^ All completely true.
To the OP; Careful, you may get told to learn how to use your camera properly
I once said the 5D2 auto iso was annoying as it didn't have the ability to select the minimum shutter speed, only 1/FL, and got jumped all over for being a noob / being lazy, you name it, and got told that auto ISO was not useful ever and a stupid feature that no-one would / should ever need / want
Anyways, I use auto ISO 99.99% of the time on the 5D3 and I love it. I always shoot in Av, and I'm always shooting people. I basically don't really care what my shutter speed is, so long as it's 1/125 or faster, and I don't really care what my ISO is, so long as it's as low as it can be and still give me 1/125; there's zero benefit to me to being above 1/125 unless I'm trying to overpower natural light with flash or whatever - then I'll be on manual mode and manual ISO - but in all other situations, me picking the ISO is a zero value-add function in my opinion -- the camera can do it just as well as I can, so there's really no reason i want to be doing it myself.
Canon were at least a generation behind on implementing this properly, and having got used to having it on the D700 (i went canon->nikon->olympus->canon, but that's a different story), it was a nightmare moving over to the 5D2 as I kept forgetting to set an appropriate ISO -- the habbit had completely left me.
If you shoot with large apeture primes, you may quite reasonably want to go from f1.4 to f5.6 between frames.. that's 4 stops. That's enought that you need to adjust your ISO even in constant light and it's VERY annoying to have to keep adjusting the ISO constantly as you flick between apetures when you've unlearnt doing it on auto-pilot. Was one of the two main reasons I upgraded to the 5D3 (the other being the AF system of course).