Yes, recently I heard the superb system of a fellow WBF member. The next morning I listened briefly to my system, and found what it could not do in comparison. In the afternoon I listened again, and on some aspects of reproduction on my system, like dynamics or portrayal of orchestral brass sections, I was going "wow, this is spectacular". Yesterday, a few days later, I was completely glued to my system, enjoying the music and what my system can do (a lot), and forgetting about flaws (including the rather severe ones of the recording that I closed with, I was just interested in the music it contained).
On another forum someone shared his experience of finding more and more flaws in his system to the point of grave annoyance. He decided to stop listening and doing other things. Seven weeks later he turned on his system again, and was floored by the wonderful sounds he heard.
IMHO these real experiences also show we must have a large statistic taken over a long time and be very careful when wanting to analyze audiophile typical behavior and beliefs. Once someone reports a bizarre or unusual story, every one is tempted to report a similar one, and this can create an effect of Bermuda's triangle.