HTML is nothing more than a markup language. We use a certain code to tell the browser when to start bolding text and a certain code to tell the browser when to stop bolding text. This is bolded. This is not. Anyone can learn HTML and it doesn't even take that long to learn.
Editors have their place.
Learning and mastering HTML is the most beneficial thing you can do as a Web designer, whether you use an HTML editor or not. I have been critized by some for the above paragraph. They would prefer a tool that allows them to be creative and not have to mess around with HTML tags. But if you don't learn HTML tags, you will be burned. You can quote me on that one.