Comment by Acorn

The idea of Open Street Maps is not to make tools for map viewing or journey planning, it's to collect user contributed mapping data for the world. That data can then be used by any project that wants to use it.

This tool (using OSM data) allows you to view routes http://www.openrouteservice.org/

I agree though, there is a bit of a lack of good quality tools using OSM data, it's a shame.