I love them, I use lime as my positive test result color, and hotpink as an alternate. I love black and white compared to other representations of them, and I have a little page with all of the named colors staticresource.com/colors.html that I sometimes use if I'm shopping and trying to match stuff and there happens to be a color close, I can sent that to somebody else and they can compare. It's a fun list, but it isn't very well rounded.
I dunno, I don't go out of my way to use them if I want to express a colour in a different way, but if you know the name, something like l-i-m-e is just so fast and easy to type :D
EDIT: Here's a list of all of the CSS named colors that are shorter than their hex representation that my friend Maxime included in his mini CSS minifier: github.com/xem/miniMinifier/blob/gh-pages/css/scr…