I think this article exagerates the effect, but it is there. After doing anything for a long time, your subcontious tendencies are to continue that action mentally. But, I wouldn't go so far as to say it compels people to swerve their car so they can "pick up" a mailbox in their "tape ball".
I can remember though, for example, after playing puzzle games for a long time, I've found myself subcontiously looking around for matching colors or shapes to put together, and stuff like that. Or if I'm working on a painting for a long time, when I finally leave my room, I start looking for the strongest highlights and shadows everywhere, and imagining what the best brush stroke would be to capture a tree in the distance.
I can't remember any recent case of "looking for targets" after playing an FPS, but that's probably because I've played so much, I'm desensitized to the effect. I do remember though a couple years ago when my friends and I would play Halo around the dorms, sometimes I thought I heard the "doot, doot, doot, dooooot" respawning sound effect when I wasn't playing.
LOL, I remember though when I was like 5 I played Super Mario Bros. before bedtime, and after having dreams of being trapped in mario land, when I woke in the middle of the night, I was trying to hit my pillow and make mushrooms come out! While I will still ocasionally have a dream where I'm playing a game, I don't think I'm in the game when I wake up.