Yeah, if you look in the owners manual GM call's it, "kickdown mode". Usually it's not a problem for me, but every now and then I end up a little short of that detent. Going wot, but going nowhere fast.
As far as I can tell its only purpose is to trick the driver, resulting in less strain on the vehicle. It would also be nice of the pedal had a soft stop, so it's easier to determine where you are in the pedal travel. My foot hasn't found the end range of the pedal; I'd have to move my seat forward..