Emmett is definitely a time saver. Even if you only ever learn the CSS selector syntax (which you probably already know), you can save a lot of time writing HTML. Being able to type div.nav>ul>li*5>a and hit tab is so useful. If you never learn anything past that (like me), oh well. It’s also very easy to wrap existing content in tags (highlight something, ctrl+option+enter, type selector, enter), which comes in handy if you have to transfer copy from another source into HTML by hand.