I've gotten in the habit myself of pressing the power button twice without the brake pedal, hitting Dest -> I Agree and then going about the rest of my business.* While I don't mess around with the display while moving, it makes it one less step while I'm not. Turning it off would be better still, if it's possible. 8)
* put seat belt on, set A/C, set cruise, set radio, etc. - THEN start the car