It's faster. There are all kinds of vim modes and shortcuts in IDEs, but only in terminal you can turn off your mouse completely and just use the keyboard. It's also faster than any GUI program in terms of responsiveness, everything happens in an instant, and there is not a single animation, even when working with a 1GiB log-file. Vim is also a very robust tiling manager, convenient splits and navigation between windows, terminals and editing buffers out of the box.