Put me down as another one who is underwhelmed by the Tsukiji Fish Market.
I think the restaurant supply stores in the area are more interesting.
I tell tourists to go to the fish market if they're really jet-lagged and want to wander around dazed looking at seafood (which brings to mind Jimmy Stewart's line from Rear Window "I've eaten things that you wouldn't want to look at when they were alive."), but that they should then head over to Hama Rikyu, look at the gardens, catch the boat ride up the Sumida River to Asakusa, and sightsee in the Asakusa-Ueno area.