There are about a thousand FP programmers to every imperative programmer, if not ten thousands. They use a tool you may have heard of, called "Excel", which is quite limited in scope.

It is an FP subset which is at the same time trivial to understand (much more so than imperative programming for most users!), and coupled with a usable I/O capabilities, is surprisingly sufficient for many uses.

(IDE, documentation, maintainability all suck, though; I wouldn't recommend it as your main FP tool if you can avoid it)