You've probably seen the TIL today about video games improving decision-making, IamA lab technician who worked for 3 years in the lab that produced those results AMA!
Dr. Daphne Bavelier first published her findings that heavy action video game players (COD, Halo, CS etc.) demonstrate superior visual attention skills in a letter to Nature in 2003.
Since then her lab has continued to investigate the influence of action video game play on neural plasticity and its potential benefits for learning. Speed of decision-making is one of the many benefits action gamers get as a result of their gaming.
The TIL I'm referring to: http://www.reddit.com/r/todayilearned/comments/1jt94a/til_that_playing_action_video_games_trains_people/
EDIT: Looks like we're done here. Thanks for the questions and to the person who gave me gold. It's been fun, and I hope informative.