First, your statement "there is no inherent chemical dependency involved any more than with any other activity", although prima facie true, as the neurological basis of psychological habituation is fairly-well understood and the same mechanisms are involved. However, this facile statement hides the fact that people become psychologically habituated to certain activities to varying degrees - saying that the mechanism is the same simplifies OCD into nail biting, even though treatment in each case would be completely different.
Second, this disregard of severity of psychological habituation (I'll call it PH for brevity from here on out) seems to be matched by a notion that a communication medium has no bearing on how well material delivered through that medium can reinforce behavior, leading to astonishing statement "people think that adding a computer into the equation makes it magically different"! This is astonishing mainly because by trying to be sarcastic, you've actually stumbled upon the truth: Different mediums for reinforcement DO lead to different levels of reinforcement. Each medium provides a different experience - aesthetic experience, information content, activity levels, etc., etc., etc. In fact, it would be pretty fucking amazing if a new communications medium did not reinforce particular behaviors very well.
Finally, it's odd that you see the internet as a neutral distribution medium. The atomized and fragmented nature of the internet makes it a lovely market for short, facile responses such as yours. It eschews long form thought and substitutes trope. In many ways, twitch response is a perfect metaphor for the internet - all reaction, no thought. And FPS games take this to a new level - all reaction, no thought, pretty much all the time. It is no surprise that you come to the defence of games as it is a perfect avatar for you. Your inability to achieve even shallow thought, coupled with nothing but sarcasm and a few common rhetorical tricks are the perfect prestidigitation for our commonly awful internet age. I fully expect to see you up-modded here.
P.S. I normally don't swat at flies. But in this case, you gamesters are all swarming around a decaying corpse that you helped devour. Get the fuck out of the way so smart people can perform an autopsy.