I've found if I use air con its a vicious circle. I'm guaranteed the next time I get in the car the windows will be steamed up again.
However if I just use the blower to clear the windows, the next time I get in the car they won't have automatically steamed up.
So I never use the air con and the only time I have steamed up windows is if I get in the car wet.
I know what you are saying is your experience but it doesn't make an awful lot of sense.
What you are saying just heats up the air in the car to get rid of condensation which, when you leave the car and it cools, will reappear. If you persist with air-conditioning it will, in my experience, dry the air in the car out reducing the propensity for condensation to re-appear...
However, they are cars, they get damp and at this time of year they will steam up...