What foods do vintners eat?
These are silly questions -- in all three cases, the answer is "if they're smart, whatever is best for their circumstances". I know mathematicians who have used Fortran, Pascal, C, C++, Java, BASIC, Assembly, Lisp, Maple, Matlab, Magma, Mathmatica, and Maxima; and that's not counting the people who do deliberately weird things (like computing Mersenne primes in Postscript).
I'd say it's more like asking "What cars do park rangers drive?" or "What foods do wrestlers eat?" because we're talking about groups of people with quite specific requirements. The question, while overly broad, isn't silly, because there's a lot of people who have no idea and have never heard of things like Maple, Magma. Heck, now I coem to think of it I've never heard of Maxima, so your answer taught me something new. And if you learn something new from the answer, it's probably not a silly question!
It is interesting to look at what languages get used for what kinds of research, and how it is affected by the researcher's level of computer science education. For example, those doing numerical analysis kind of research tend strongly toward MATLAB, with Python getting a lot of use from those who are relatively well-educated about computer science, and the lower-level languages used by people with extreme performance needs or who haven't learned any of the newer options. On the other hand, I doubt that any of the numerical researchers I work with have even heard of Haskell, and while some may have heard of APL (though definitely not J), none could use it.
Now what's so weird about that ?
In postscript (which is actually quite a powerful language) sounds a lot less weird than doing it in brainfuck or something like that.