I am less frustrated, and more focused working on this setup. A big chunk of that is even outside the constant popups in OS X, there’s simply less to be distracted by.
I’ve gone so far as to have to literally switch a cable to move between machines (as opposed to a KVM), to help me train my brain into a different context.
Overall I’m quite happy with the choices I made here.
A nice write-up from someone switching from OS X to FreeBSD, and everything that entails.