IIRC Docco uses line comments, I'm not sure what your complaint is about. Besides, Emacs has two-column editing mode, making it possible to have side-by-side comments without any external tools. Also, third-party packages like separedit allow comment editing in an indirect buffer. My point is - with little regard for how it's written originally, Emacs (more than any other tool) grants ways of making it suitable for you, personally. You can make things more readable, or optimize them for writing.