John, you are correct the NG is reasonably fast to spool up.
I was thinking more of the case where guys (gals) line up by following the taxi off lines, stop, get a clearance to takeoff, release the brakes, start rolling whilst they faff about setting 40% to the 8th decimal place and then eventually hit the toga buttons.
IF the crews line up in the line up distance and keep it rolling I agree that there is no drama, but the scenario described above happens quite regularly unfortunately and means that people are not really aware of what they are trying to achieve.
Sydney 16L is a good case in point where it has a displaced landing threshold, but the start of takeoff is at the runway entrance, people see the piano keys and almost taxi up to them before getting going - a recipe for disaster!