Noise does not seem to disturb me, but perhaps it is because I have some fast lenses and powerful flashguns, both of which enable me to use fairly low ISO settings much of the time. I was mentored in DSLR use by my wife, when she had a county-issued Nikon D300s and Nikon SB-800 flashgun. I then started using a pre-owned ensemble acquired from one of my wife's friends, a Canon XTi (400D) with a 580EX flashgun and several lenses, one of which, a Tokina 2.8 macro, is fairly fast, and I soon acquired a 50mm EF 1.8. Within a few months, I had upgraded to a 40D and my first 7D, and my first L lens.
On the other hand, I have yet to acquire a large monitor, so maybe I do not know what I do not know.
It would, indeed, be very nice, of course, if the anticipated 7D Mark II has lower noise at higher ISO. I am hoping more for better AF performance in low light, on the level of the 6D or better, as the 6D's low-light AF seems to best-in-class at present. Of course, I could just buy a 6D, but prefer the ergonomics and controls of the 7D/5D3 bodies, and the 6D's AF performance advantage in low light is, if I recall correctly, only with the center AF point.