I've noticed difference using that method, on a previous car: with Bridgestone Ecopia EP20, I could easily give a push with my foot and get the car rolling on the slight decline, out of the garage and into the driveway. Repeat with Nokian WRG2, you really had to "stand on it", to get it rolling, and then keep at it or it stopped again.
Well "fail" is when I have to keep foot pushing till the driver's door snags on the garage door, on the way out, lol.