Throttle is "fly by wire" in other words when you press the gas pedal the ecu detects it and then opens the throttle with a motor.

Car makers think it's a good idea to adjust the throttle response to match the driving type or style. They can change the amount the throttle opens for a certain amount of pedal travel or change the rate of opening.

The reset removes "learning" the car did, probably while you were in traffic or on a freeway and makes the response normal, makes you think, could it be tweaked more?

Personally I wish they didn't mess or as I have an auto they only messed when the switch near the stick was on W (never).