I don't know if Forth exists for VMS but COBOL, FORTRAN, Pascal, and Basic are all available.
Forth was used to eliminate overhead of OS's like VMS dedicating machines to specific tasks, instead of running under the OS. Under the OS is when supplied assemblers were needed, to get links into the OS, from libraries.
Forth was for imbedded systems or running development inside an Arduino itself instead of an external aid, with it's compact methods. Don't know if Arduino's can do it, but little 8-bit machines did with 16K of memory.
Books on Forth still being released as recently as 2007, check Amazon
. Someone uses it.
Done forthing at the mouth. Back to vacuuming. Hope you were entertained.
[addendum: Forth definitely used on Arduino: http://www.offete.com/328eForth.html
and other; search forth arduino.]