No, but I do it for formats like HTML, CSS, JSON. My editor can assist me, but I don't need it. To a lesser degree, the same is true of Java, though I do admit to leaning much more heavily on my IDE for that.

> What is this obsession with hand-coding complicated formats :)

Well, part of it is that they're not all that complicated unless you're doing something fancy. Another part is almost certainly our (we as in developers) pride in being able to use nothing but vi installed on a decade-old operating system to get things done.