Years ago, I was a bullet-chess (1 min. games) addict. I played daily and often. Then I stopped for about 4 years (and played off-and-on). My rating was mediocre - around 1400 on Yahoo Chess.
Recently I started again, 3/0 games and blitz games. I noticed that I play better overall, but I can't pinpoint what it is - I just know I can see combinations better. I wonder about this a lot , because as I age I should be slightly slower mentallymentally (i'mI'm close to 30).