A known control scheme like a game pad is more or less invisible to a skilled the player, it doesn't take mental processing power to translate a desire (moving forward in the world) to a successful input (moving left thumb stick up) but trying to trigger a gestural binary button like the «move forward» gesture in Star Wars Kinect takes the player out of the experience. (copenhagengamecollective.org)
Players use the left thumb stick to move their player across the level. (slickstermagazine.com)
Also, the left thumb stick is used to bump the table, but use this sparingly because it is really sensitive. (andymerrill.com)