Embedded Scheme

Why the fuck did bash/vim have to make up their own languages instead of using a pre-existing one, like, say, Scheme? No, I have to waste time learning your toy language's syntax. Seriously, if Scheme was designed to be simple and elegant, why isn't it used more often as an embedded scripting language?

Is Gimp not scripted with a lisp dialect (scheme-fu i think). And why not python while scheme is a beautiful language the amount of () can be freaky will python is C without the crap.