That's a bit of an exaggeration; Xorg isn't GNU, neither is Firefox, or a lot of other desktop and server applications and programming environments beyond gcc.
It also depends heavily on the machine; if you use GNOME then you've got another big chunk of GNU in there, but in my case the only major part that I actually use frequently is GNU libc, a subset of the GNU coreutils (which I'd very much like to replace with something better by the way), and maybe a few others libraries left or right used by some applications.
But beyond that it's just occasional stuff (GIMP for example).
On my Alpine Linux servers I'm not sure if there's any GNU.
It also depends heavily on the machine; if you use GNOME then you've got another big chunk of GNU in there, but in my case the only major part that I actually use frequently is GNU libc, a subset of the GNU coreutils (which I'd very much like to replace with something better by the way), and maybe a few others libraries left or right used by some applications.
Isn't GNOME independent from GNU nowadays, it has its own foundation?
I'm not sure; it's listed on the GNU website but https://www.gnu.org/software/gnome/ redirects to gnome.org, and I can't find GNU mentioned on gnome.org at all. GNOME also has its own infrastructure. So yeah, any relationship between GNOME, GTK, and associated projects seems very weak at best, if it still exists at all.
It also depends heavily on the machine; if you use GNOME then you've got another big chunk of GNU in there, but in my case the only major part that I actually use frequently is GNU libc, a subset of the GNU coreutils (which I'd very much like to replace with something better by the way), and maybe a few others libraries left or right used by some applications.
But beyond that it's just occasional stuff (GIMP for example).
On my Alpine Linux servers I'm not sure if there's any GNU.