This is more of an anecdotal bent, but I've long felt that knowing multiple programming languages makes me more productive and confident when using any one of t

This is more of an anecdotal bent, but I've long felt that knowing multiple programming languages makes me more productive and confident when using any one of them, because I have a better understanding of where their respective strength and weaknesses reside in a broader spectrum. Now, this year I took to learning Korean as a hobby, which is markedly different from my native German (and English) - and I think I'm starting to see this pattern replicated in that realm to some degree. Particularly because the vocab has completely separate etymology. It's giving me some new general insights into how humans approach certain topics, which factors transfer and hold true across the different language spheres and which don't, that sort of thing. It's incredibly satisfying even in the little time I get to spend on it. So at least in that sense, I think you can get something similar out of the two.