Even this huge unused airspace would be used by commercial jet aircraft climbing and descending to higher altitude somewhere.
It isn't because the route accepted by the Eurocontrol computer will take you away from those areas.
Mike Jenvey - you are right IMHO and some VLJ operators may get suprises. However, there won't be suprises on routings
granted by Eurocontrol because you know the filed route before you fly. It may be 700nm for a GC distance of 600nm...