I find elixir incredibly good for CRUD-type applications, macros and pattern matching alone get rid of most of the duplication and hard to follow logic that plagues most web frameworks.

Phoenix is quite popular but if you look at the source, it's a testament to Elixir's power as a language how light it actually is, the meatier bits are mostly around working with real-time connections, the cookie-cutter web stuff you can achieve with plug with very little work.