Counting calories is a great way to lose weight actually. Every time you go to eat something you think "Do I really want to record this in my food log?" Then you say no and don't eat it. I ate drastically less as a direct side effect of trying to count calories.
I wonder if can affect variety of the diet though? "I have no idea how many calories this salad is, let me eat that well measured donut instead and be done with the paperwork" would totally be my train of thought...