Yes. These are the time-honored tools of hacking. They've been around for decades and run largely the same way as they did back then, over any sort of UI, local or remote, even a bare VT100 terminal. Understanding these editors will provide you insight into how the hackers of the past worked, and why some prefer these editors even today. Even if you stick with your preferred tools in your day-to-day (and that's fine, everyone does their best work in different ways), the additional perspective gained by understanding these old tools, their general shapes largely unchanged by time, will be valuable to you as a programmer.