Wow, such ignorance in this thread. Truely astounding. I believe that what the TS is getting at is after a long run of racing in GT5, say a marathon of laps at Nurb for instance, then having to (within minutes mind you) get into your real life car and drive, there's a tendency to drive as aggressively as you would in the game. I know for one that I'm a lead-foot when this happens. I do find myself looking for ways to cut corners to carry more speed through them. I still am following all the applicable laws, just very close to breaking them is all. Now, on the other hand, after a day of not touching GT5 I get into my real world car and drive, I'm much more apt to drive "normally", that is easier on the throttle, taking turns the every-day way and so on.
Long story short, I side with the TS on this and have experienced it myself.