...both the main text editor (UEDIT) and the command shell I used (CSHELL) under OS2200 at my former workplace were written in a scripting language (CALL). They worked quite well, and the ability to kick into the debugger at will was an extremely valuable feature at times (since I maintained them both <g>).
The language was also very good for writing small utilities if I had a need (I used it to write things like head, tail, cal, various file parsing utilities, etc).
(Note: there was no C compiler available, and languages common to the Unix world like perl were also unavailable on our OS2200 boxes, or I'd likely have used those instead. As it was, CALL beat using Fortran, MASM, COBOL, or SSG for that kind of stuff...)