On the way to which instances? I would have thought that BC took most of the high levels away from Azeroth and old world instances.

Most of the chars I leveled got ganked in the usual places like STV (especially when ZG was all the rage) and TM/SS. Then the occasional Barrens raid, but Barrens is non-contested if I am not mistaken.

If I didn't want to be ganked all the time I usually went to the more quiet zones like Desolace and Badlands and Swamp of Sorrows etc. The path less travelled so to speak.