As someone who is fluently bilingual and speaks a third language and is also proficient or better in a half dozen programming languages along with having written code in many more, this is completely obvious to me. Learning a programming language is much closer to learning a complex board game than it is a natural language.
Your comment is insightful and suggests that perhaps we should try to design a programming language that feels more like a natural language.
As others have said in this thread: programming "languages" are not like natural languages for a reason, and conciseness is a big part of that. The two fill a completely different role, and it should be obvious that the brain structures involved are different too.
To illustrate that: the only reason people are surprised that programming languages and natural languages are dissimilar is because our natural language is ambiguous: it calls them both "languages" even though they serve entirely different functions.