[vouaobrasil]

I'm a PhD in math. I love category theory and it's very useful for studying abstract algebra at the research mathematics level because it clarifies concepts and even provides algorithmic ways for computation at that level (e.g. adjoint functors and cotriples to compute homology). But to be honest, except for computer science researchers, I would not recommend it to programmers. I am also a programmer (at least a part-time one sometimes, and previously full-time), and I can say with absolute confidence that a deep understanding of category theory is 100% useless for programming.

Again, with a few exceptions, but if you are one of these exceptions, you will already know it.