Think old school throttle cable tightening.
With the drive by wire technology there is no cable to tighten, so there is little one can do to increase throttle response. This increases the signal and tricks the computer to thinkning you are pressing the acceleator more than you are (to a point). So it basically eliminates/decreases the throttle delay and the throttle dead spot.
It is cute to liken this to an electrical supercharger. One claims to be a performance item, yet does nothing but essentially decrease airflow, and is widely regarded as a useless gag. The other does not claim to increase performance; just to reduce throttle lag commonly associated with drive by wire technology. Additionally it is widely used by many different automotive enthusiasts. (e.g. Google Mini Cooper sprint booster)
That being said, I decided to share my experience because I know there are likely many Dads like me that had to give up their sports car for family car, and this helps the Journey to drive a little more like a car, and a little less like a mini van. To each their own.