I've been following the controversy, and I was hesitant to purchase the new Blu-ray set, but I bought it the weekend after it was released (I just couldn't wait). After watching FOTR, here's my take on it:
Is the color change noticeable? Yes, definitely, in some scenes more than others.
Would I have noticed it at all if it hadn't been all over the internet? Probably, but I'm honestly not sure.
Did it detract from my enjoyment of the film itself? Not a bit. While I found myself examining the color grading more than I normally would have, I inevitably got swept up in the film itself and forgot about it, and this is at least the fourth or fifth time I've seen the entire thing. Overall, the Blu-ray looks stunning, and in the end, the color issue just didn't bother me that much. If it was indeed a mistake, I would love to see it corrected some day (without additional cost to us, of course), but for now, I'm happy with the set.