Having a heavy right foot isn't necessarily a bad thing as long as you can keep it at a reasonable speed. The real drawback is the increase in fuel consumption. Nissan decided it was time to help consumers reduce the amount of fuel wasted during "jackrabbit" starts between lights.
The idea behind the system it to calculate the most efficient speed at which to accelerate based on the amount of fuel being burnt. It will also factor in a few other variables. Once the level of acceleration has been determined, if the drive pushes the pedal past the point, the pedal begins pushing back.
According to Nissan the "ECO Pedal" could increase fuel economy as much as 5 to 10 percent. This is assuming people will actually keep the system activated. This is the 3rd of a 3 part plan by Nissan to help reduce carbon dioxide emissions over the next few years.Via : Detroit News , Jalopnik
The response to this system has been mixed, but for the most part the major concern is safety. Many people are wondering how hard the pedal will push back if a quick acceleration is needed. The design has potential, but I think a fuel consumption gauge is a more effective means of making people realize how much fuel they are wasting.