I'm making a language that is equivalent to (and compatible with) C++, but has a regular grammar, bison is quite pleasant to work with, and the lalr grammar is potentially reusable elsewhere (in javascript, with jison, in haskell, with happy, in go, with go-yacc and so on). It also allows me to change the language structure very quickly which is very important when designing the language. In the future I'll write a recdes parser as well, because I also want pretty error messages, but the parser generator saved me a ton of time so far and will continue to for a while.