Ground service at YYZ was handled by ATS at the time and their level of non-service has now been expanded. I can't begin to describe how upset the gate agent at YYZ was and how she urged all of us to write. Little did she know where that would lead. Our designated gate was occupied and they sent us off to Siberia - gates in the 800's in an ancient extension with only Beech D-18's around us and of course, using the internal steps to the tarmac. Followed by a walk to the terminal that was as long as any I ever have done. And the CRJ was going next to Denver with the same crew. The poor folks waiting for that flight out there in the boonies were really getting a raw deal.