Oh I have absolutely no doubt that Knuth can code better than I (or most people in this thread) ever hope to.

But being a programmer and a computer scientist -are- two very different things. Simply in his daily activities over the last sixty years, Knuth has been writing tens of thousands of pages, doing a lot of math, diving deep into computer science topics. (That is not what I do in my employment as a programmer.) This guy has been sitting behind a keyboard and writing code. (That is what I do.)