Sometimes I think the same thing about what I do. Then I work with a junior and appreciate the difference that a decade+ of accumulated knowledge, instincts, and intuition makes. Yes, most of us don't gain ability the way a surgeon or aerospace engineer might, it's not that palpable, but don't undervalue yourself nevertheless. It takes a lot of work and dedication to get to "I can reliably and predictably snap stuff together like legos and make a functional system."