A GUI with a 1-1 mapping to command line arguments sounds like heaven. Of course this exists for something like GVim, but I had no idea commercial software of any kind was doing it. That makes scriptability possible!
Yeah, AutoCAD is old so you have a lot of people with old command-line habits. I first used it in like '94. Loved the command-line and gui hybrid it used. Commands were composable too, like the "line" command would then ask you for where the first point was and you could use locator commands like "midpoint" or "endpoint" which in turn would take an existing line object as a parameter to select the origin of the new line. Haven't touched it in over a decade though, no idea what it looks like now.