I sure don't. For one, my poor little brain has too much to focus on (school, work, family consisting of Rex and 4 adorable cats). Secondly, I find that I guilt myself into making poor choices in the long run. Yeah, that snack is only 100 calories but it has more sugar than I'm supposed to have in one sitting so my sugar inevitably crashes. Then I binge at my next meal. What good did that "healthy" snack do me? Not much.
Check out this article that discusses why calorie counting, specifically at restaurants and fast food joints, doesn't do much good for those of us trying to avoid being categorized as overweight or obese.