"To use the gamepad" means to operate or control a video game console or computer game using a handheld controller that typically has buttons, joysticks, or other input devices. Full definition
The puzzle - platformer, which will have features such as using the Gamepad as a camera and a level editor (not available at launch), should be making its way to the Wii U in a matter of weeks. (wiiugo.com)
Such an oversight to not do local multiplayer with one player using the gamepad screen and the other using the tv. (nintendotoday.com)
Granted you don't use the gamepad for those exact things / reasons, but my point still stands - your focus isn't always on the TV / game regardless of the platform you're on. (n4g.com)