I've only been programming professionally for 3 years now, but already I'm shaking in my boots over having to rethink and relearn the way I've done things to accomodate these massively parallel architectures. I can't imagine how scared must be the old timers of 20, 30, or more years. Or maybe the good ones who are still hacking decades later have already had to deal with paradigm shifts and aren't scared at all?