I've actually used it a lot as a sort of "sane" scripting engine that I could include with other software to deal with various configuration tasks that would be too painful in DOS batch or (somewhat less painfully) bash.

So it has gotten used a lot around the edges of other software that I've written in C# or as part of config steps in InnoSetup.

It's a great tool for random little messy bits that need to be done where you don't want to deal with installing something larger.