Most web development workflows emerged in an era of monolithic, server-side driven application development. Lots of server side code (as well as navigation logic and session state), relatively small amount of browser side code. In recent web app development, client side now has a larger proportion of the code and complexity. Developers tend to make incremental changes to their workflow rather than "starting from scratch" seem to miss the shift that has taken place.

One of the best examples of an efficient workflow (at least in theory) that I have seen is the Play framework, along with a browser plugin that causes the browser to refresh every time source code is saved (http://www.jamesward.com/2013/05/15/auto-refresh-for-play-fr...).