Low-level hardware bringup?
Perhaps the reason this only ever ends up being managed by one or two people is that >2 people simply do not need to manage the fussy details once they've been abstracted/normalized out.
Also, I lurked in comp.lang.forth for a week or so a while back and learned that Mattel were using Forth as a runtime for their toys back in 2004, at least: https://groups.google.com/d/msg/comp.lang.forth/omi6PUvymEE/..., https://groups.google.com/d/msg/comp.lang.forth/LzOasFOyIMg/...