I'd argue even further that Excel is the most common flavor of LISP installed.
=IF(A1 = 1, A2 * 3, MAX(A3, A4))
is remarkably similar to: (if (= A1 1) (* 3 A2) (max A3 A4))
The difference is mostly infix vs prefix and the naming of variables. Not only is Excel the single largest low code install, but its also a gateway to LISP if you introduce it to people correctly.