I have absolutely noticed that! Any sugar/carb concoction always leaves me wanting more. Before I got a handle on my addiction to sugar and carbs I reached a point of being 60 lbs overweight--in other words, OBESE.
But back to your point, I have absolutely noticed an association with eating carbs and wanting a coke--even diet coke. And I have noticed the reverse effect, too, of wanting something carbish after a diet coke.