Something about having a command line interface really makes it feel like you are communicating deeply with the software, as opposed to poking around its surface in arranged flows. With a command line the interaction is different - it is exploratory with freestyle flow composition, and that can be really fun.
Modern graphical interfaces combined with a means to freely manipulate data and compose commands seem to be quite rare. I have always wished to have a full command line accessible in RPGs inside the game's menu system, so I could script some tedious things.