I understand it’s bad for leveling, however there are reasons people might want to quest there. I followed the guide and went to Darkshore.
1. I’m an Alliance Warlock. There are no Alliance warlock trainers in Kalimdor. I have to take the boat to Stormwind to train.
2. You can get Stormwind reputation from doing Westfall, which is helpful for those people seeking to reduce mount costs.
3. It’s very time consuming to get from the Eastern Kingdoms to Kalimdor. I followed the instructions in the guide and incurred a durability penalty, which low level characters can ill afford.