Originally Posted by
Consiliem
That is mostly correct, with the exception of Suramar. Suramar does not scale down, it will remain a 108-110 end-game zone.
But you can run around the other 4 zones as you please, and the mobs you encounter will be scaled to your level.
Edit: worth mentioning, consider that any Blood of Sargeras that you obtain from a strictly herb/mining alt will have little to no use, as they are BoP and have no real use for gatherers (currently). Not sure if you were aware of this, thought I'd double check