The level of concentration required to undertake a zero/zero departure up to the IFR environment with no SAS or FD is at the top end of any pilot ability. We didn't make it easy for them in the SIM. I'm not talking poking your head out over a dust cloud, but a long period of intense instrument scanning. Back to the same scenario in your 139, you add the boss man banging on the glass and tapping his watch, you need all your experience and everything else you got in that bag to make it through. I do agree though, that the procedure may be a useful addition to any pilot's tool bag, but it must be reviewed regularly in SIM or training sessions in the civilian world.