Thanks for the suggestion. I'm looking for something that is more interactive though. Ideally it should be like a love child of MS visio / LibreOffice Draw and vim ;)
Just my two cents: for formal diagrams I find code is often faster than interactivity but feels slower because the output is indirect and so it doesn't quite feel like I am doing as much.
For me this is the case as well if I know what I'm drawing. If I need to find a way to 'put things on paper', I'd rather have some interactive options, preferably speedy ones ;)