Not quite. Around 70% of the time, I'm in pure Chrome OS. The 30% I start a GNOME 3 session is to edit in Sublime and do some light image editing, and since GNOME 3 is pretty much full-GUI now without many config files, it's one setup and done.
That said, let's say I do -- so I download and double-click the MacPorts installer, and then run 'port install' to install an X11 app from a binary package.
Not that I'd want to.