Originally Posted by Nitz Walsh
Perhaps hunching over like a gargoyle is an exaggeration, but the very fact you need a flat surface to use a mouse/keyboard on precludes the fact that for 99% of PC setups you'll be sitting at least upright with your face close to the display.
Leaning back on your couch with a controller is indeed a different experience. Can't always do that either, which is why I like the choice of control styles the PC gives you.
Every office chair in existence reclines though... the whole point of an office chair is to keep your back straight but also let you lean back. If you are leaning forward toward the monitor to game I assume you just like that position, in which case you probably lean forward on the couch as well.