Umm. That's now how i see it. You get the same throttle for the distance, but it just starts moving faster. It just reaches 3,000 faster since there is no lag, and you can let go of the peddle earlier because it gets there that much faster.

[Idle]---LAG---[takeoff]---[3,000 RPM]
with SB

[Idle][takeoff]---[3,000 RPM]