Mathematica is a truly fantastic tool which allows you to analyze and visualize large amounts of data, and many many other things which can be very helpful.
If you are not very well acquainted with Mathematica and you do not do scientific programming I do not think you will gain much from it, and other tooling - more relevant to the tool chain you use - will most likely be more useful.
I don't use Mathematica, but I do use a similar but free (as in both speech and beer) program called Maxima. I do very math-heavy work scientific computing work in bioinformatics. I learned Maxima primarily for some math-heavy courses I was taking, and for solving problems that are more domain-related than programming related. Nevertheless, it's since proved occasionally invaluable to me even in a few programming related cases:
It's a very good arbitrary-precision calculator for when I'm trying to figure out simple arithmetic with really huge numbers, for example, figuring out upper bounds on how much memory a program could use or how big a number could get and what integer width I'd need.
If I have an equation that I need to program, plugging it into Maxima will make it easy to see it in all kinds of different forms so I can select the most computationally efficient one.
I've only used products like Mathematica (Matlab to be precise) when working on DSP projects. While the current job/project involves modeling heat transfer, the folks working on that part of the project are all mechanical engineers. They are using Python not Mathematica.