I've written parsers for context-sensitive grammars, and as it turns out, this is not a desirable feature of a language. The reason you typically see simple parsers is because simple grammars are usually unambiguous and context-free, which is more convenient for humans to understand and internalize.
After all, when you're writing software, you pretend to be the compiler to some extent.
Natural languages, like English, are a good example of something which humans struggle with because they are complex, ambiguous, and often require context. Sure, it's extremely expressive, but that is the sharpest double-edged sword in programming languages.
