Scribble vs click

Is designing on screen a mistake? Or a sin, even? I am occasionally guilty of going straight from brief to Mac and wasting hours pursuing a design that will ultimately be visually akin to something thrown at the wall of a baboon enclosure (shortly after being excreted by the angry primate). Most design folk insist that the computer is only a design tool, to be used as the design dictates, rather than the hardware dictating the design…but have you got time to doodle?
Already constrained by brief, budget and time, do I want to be limited by the software I use or by my own brain? Saturated with coffee and fogged by paternal lack of sleep it may be, but my brain is where I find most of my ideas.
Designing straight to screen involves translating the thought into something the computer will understand: clicks, double clicks, nudge, click and drag, keyboard shortcuts, triple click, nudge, scroll, click. Then the hardware translates these signals into the design. Does it look like you intended? Well not really, no.
Designing on paper is simply translating a thought into movement of the pen.
Until someone invents an interface that allows a computer to keep up with the human mind, the pen remains the fastest means to visualisation. It is quicker, mightier and more versatile than the mouse.