Interesting article you linked to and something to consider certainly. That being said, I somewhat disagree with you about the histograms being misleading. His color scheme looks to be based much the same as thermal imaging. Which I find is quite clear about what are the 'hot' zones (or in this case high point density) and the 'cold' zones (or low point density).
I think zacharyvoase's point was that it might either emphasize or deemphasize how much hotter or colder something was. Because the eye doesn't see blue->yellow->red hue changes consistently, what looks like a "big" change on the graph might actually be fairly small.
