HTML is not the problem when you're designing. For an experienced front-end developer the gains are minimal. A more significant part of the time spent creating

HTML is not the problem when you're designing. For an experienced front-end developer the gains are minimal. A more significant part of the time spent creating a webpage is wasted on CSS (or in javascript but I don't put it in the same boat). So if you have to optimise your process it's more efficient to learn something that will improve your css workflow (Sass, Compass, Less) than to add a layer above your html code.