This quote actually captures the sort of issue/gripe I have with being a developer (let's say you don't ascend high into management) for the rest of your career. No matter how good you are, you still have to write individual lines of code out, one-by-one. You'd be a glorified factory worker, albeit a very efficient one (years of experience would make your solution more efficient and architecturally sound from the get go).

Not to mention some very keen, obsessed younger developer could easily replicate what you're doing.