Personally, the nice thing about a color name (maybe not these color names) is that it tells you what it's supposed to look like. So if you want a tomato color, you can use "tomato", and not worry that your monitor is or isn't calibrated correctly.
If you're at all color blind, trying to design using color codes is probably an exercise in frustration.
Maybe what you need is a separate tool that tells you what that specific color code most looks like, sort of like xkcd's color survey:
Says the author: "I have no opinion about whether it should be used to build a new X11 rgb.txt except that seems like the transition would be a huge headache."
If you're at all color blind, trying to design using color codes is probably an exercise in frustration.
Maybe what you need is a separate tool that tells you what that specific color code most looks like, sort of like xkcd's color survey:
http://blog.xkcd.com/2010/05/03/color-survey-results/