If rabbi means what I think I can just make out from his defensive posts here, then I must admit that I'm the same... And I think it's from playing LFS.
It's nothing dangerous, actually. Just that when you're driving you're completely at ease with yourself the car and all the stuff that's going on around you... To actually KNOW that some idiot is missing the on ramp they should have taken, and slowing down for them to take it before they themselves realise their mistake. To KNOW someone is in a hellish hurry and wants to pass you on the left before taking the right turn on the lane opposite of the one he's on now (and then making sure he misses the turn completely and watch him/her go mental because I didn't give him/her room). To have the confidence of knowing you're in control of the situation, even though at any moment something might happen that snaps you back to reality.
I never ever feel like being invincible. But I am a far superior driver than most when it comes to anticipation of other people's moves.
And a lot of people feel that way, even if they don't admit it...
And yes, getting upset at others is just part of my waking up ritual. I don't go around pushing them off the road, though. I just call them names from the safety of my cockpit, and go on driving in a safe and confident manner.