I think very few people "live entirely in a terminal". I've never been all that big on IRC or mutt and the like, or "do X from the terminal!"-type programs, but a huge chunk of what I do is writing stuff (code, or just plain text), and Vim works pretty well for that. I also find it works very well for managing files and such; for example a few weeks ago I took over an old Go project, and I wanted to fix some of the "if foo == false" conditions to just "if !false", as well as reformat with the newest version of gofmt, so:

    for f in **/*.go~vendor/*; gofmt -w $f
    for f in **/*.go~vendor/*; gofmt -w -r 'a == false -> !a' $f

I guess maybe you have some buttons for that VSCode, but this sort of stuff is pretty fast to type out, and you have a lot of control like "exclude this directory" (like the vendor directory in the example). You can also do more advanced stuff; some time ago I wanted to see how much space my qemu images were using so I could use reasonable defaults for new versions:

    for f in *.qcow2; printf '%-30s %-15s %s\n' \
        $f \
        "$(qemu-img info $f | grep -o '^virtual size: [0-9.]* [KMG]iB' | sed 's/virtual //')" \
        "$(qemu-img info $f | grep -o '^disk size: [0-9.]* [KMG]iB' | sed 's/disk size/used/')"

Which is a bit hacky, but it's a one-time command and it prints a reasonable nice-ish table. This kind of stuff is much harder from a GUI.

It's really flexible and just as "simple" or simpler once you know all the tricks. Learning all the tricks of course takes a long time; say hello to my teenage years with no friends or girlfriend.

Anyway, aside from file management and Vim I do almost everything in the browser, and more or less always have, but for some things it's hard to beat a good shell.