I have to sit through lectures each year at work about how to setup your whole desk area and chair etc, so you don't have a problem (RSI, etc) and won't sue the company. Due to that I do all the same stuff at home. It's annoying to get the lectures, but it is surprising how many people setup their environment so that it causes strains and they have to sit in odd position because the monitor is off to one side or there is no foot room under the desk etc. Anyone who wants to game on a PC for many hours at a desk should check out this type of stuff, as you maybe doing your self an injury.
But this should not cause people to avoid using the PC for gaming, as anywhere you can game with console, you can game with a PC. This idea that with a PC you cannot lounge on the sofa and game is stupid. I have my PC connected to my TV in the front room and the only time I adopt a gaming posture different to a console player is when needing to use a mouse and keyboard. But I would take a lot more discomfort to be able to use a mouse and keyboard over a joypad for certain games, any day of the week.
Also since razor have a decent looking motion controller coming out for the PC which looks decent for FPS games, maybe the mouse and keyboards days are numbered.