I don't know about other successful quitters, but the passing of time has made it easier and easier to deal with a desire for a cigarette.
The feeling of wanting one is less frequent, it's milder and fleeting.
It's a reinforcement that I see ticker racking up the days I've not smoked, the thousands of cigarettes not smoked, and money saved.
Ah, just remembered, there is also the amount of time I've not wasted smoking. If I count each cigarette as a use of 15 minutes (to get to a smoking place, smoking, and returning to where ever I needed to get back to), I've saved 3,217 hours.