I have noticed a big difference in throttle response between a "cable-throttle" controlled vehicle and a "computer-throttle" controlled vehicle. Vehicles with a computer system activating the gas pedal seem to have somewhat of a lag when accelerating. It's only for a split second, but is noticeable.
A good example would be between my idi and 6.7 psd. If I stab the throttle on the idi, it is very responsive and rpms go up almost instantly. On the 6.7 psd, you stab the throttle in park, rpm's will go up, but not as rapidly and high. It's almost like the computer needs more time to process what just happened.