I wasn't alive in the 70s, but I still prefer a terminal.

I can string together a complex series of text-related tasks far more effectively as a shell pipeline than I can by pointing and clicking in a UI. I can scale that sequence of tasks out to operate on every file on the filesystem if I want, or down to a single character in a single file.

Claude Code being a full-featured TUI is also helpful because I can quickly/easily use it remotely via SSH without having to deal with setting up X forwarding, VNC, Parsec, etc. The remote host doesn't even need to have a window manager. Sure, it'd be nice if it also had an elegant multi-page GUI so I could more easily drill into the actions its performing and make better use of my large screen to watch it do multi-agent things, but if I have to choose between the two, I prefer the TUI.

That said, I'd much rather use a GUI to do things that are actually visual/spatial in nature.