[vidarh]

I couldn't imagine using Forth for all of my programming, but personally I quite like the thought of underpinning a more complex system or language with a small language like a Forth or Scheme, or just something borrowing key elements. Use them to shape the basic structures at a level where they excel, and then put one or more other options on top, and interfacing with a layer far more pleasant than a bare machine.

E.g. for my experimental long-languishing Ruby compiler I bootstrapped a tiny typeless s-expression based language - not a lisp/scheme, just borrowed some syntax - to let me "escape" the warm embrace of Ruby to bootstrap the basics. It wasn't very carefully planned, and there are many things I'd like to change when I get time to play with that project again (it's been literally years, but it's not forgotten), but that aspect is part I still like, though I might like to change parts of that low-level language too.