We use Haskell heavily at my startup and it's definitely a competitive edge and well suited to the many general programming problems we solve with it (amqp processing client, rest api, javascript heavy webapp w/ haskell web framework backing, db orm modelling, scrubbing and feeding data into influxdb, the list is long).

I know quite a few professional programmers who credit Haskell with making programming fun for them again (this holds true for me too and my production skill set includes php, c, c++, python, ruby, erlang, scheme, javascript, scala).