It's a good article and all, but I'm one of those old fashioned types who still thinks the best EQ is no EQ. I try to write, arrange, and record songs in such a way that no instruments and vocals step on each other. I seldom have distortion on rhythm guitars because then you have to make vocals and drums thin and wimpy to be heard over them and so on. It's those distorted rhythm guitars that are the biggest mixing obstacle in most cases. I also try to do fills in the spaces where the lead singer isn't singing. Otherwise you have to thin out the vocal to be heard over it, and that's true of any instrument, not just the distorted stuff. I learned that from Hank Garland. Listen to his playing on "Little Sister" or "Jingle-bell Rock". He always left room for the vocal to be heard.
I realize there are certain styles of music where it's common to have a bunch of things constantly going on, including non-stop distorted guitars, but anytime you can keep that stuff to a minimum, the less EQ'ing you'll have to do, and the fuller everything can sound.