I was just looking across the various editors/languages I use and though I have some variations, my main environments both have comments as green (on a dark background), and -- I suspect this is key -- nothing else uses green.
The contrast between hues has the enormous benefit of being both obvious and ignorable at the same time, depending on your frame of mind -- comments stand out, but it's also easy to think "brain: ignore anything green". I suspect this would work with any (primary?) color (though it will change what other colors are available for everything else)
I do have one environment (which I barely use) that has comments as a dull gray like the article has, and now that my attention has been drawn to it I realize I actually kind of hate it, and I'll probably end up changing the color scheme.