I'd have to beg to differ.
As someone who is passionate about food, cooking and in particular, japanese cuisine - going to Tsukiji was really an amazing experience.
Learning first hand from a wholesaler about the daily process of acquiring stock which they go on to sell was fascinating. It's really astounding that people are going there every morning and inspecting ~1000 tuna for a mere few seconds, inspecting only by colour and occasionally the fattiness of the tissue in their fingers. These split second assessments then lead to them making a ballpark valuation of the stock which they take with them to auction - the decisions affecting their livelihood.
If you have had the opportunity to sample sushi from across the spectrum of quality - you'll know full well that there is good sushi and bad sushi. Considering sushi is something like 7 ingredients (rice, mirin, soy sauce, sugar, fish, vinegar, wasabi) the execution of the dish and the quality of the ingredients are absolutely key. Being able to go to the heart of where everything begins is really quite exciting.