Three things that make the experience of developing in Elixir completely different from Erlang: Tooling, libraries, and actual language features (that aren't just skip deep).

Spend 5 minutes developing an app in Elixir and you'll realize why it's not just "only syntactically different" from Erlang.

I gave credit insofar as language features, hygienic macros and pipe ops are both wins in my book.

Which libraries and tools do you think set Elixir apart? Do you prefer it to erlang (I've seen you in #elixir-lang ;)?

Here's an old (18 months ago) exhibition of Elixir's improvements upon Erlang oddities and difficulties:

http://devintorr.es/blog/2013/01/22/the-excitement-of-elixir...