Its less about time to travel (I have no problem using flight paths) and more time waiting for a tram/ zeppelin to come for the first time. And when Tauren players finish their starting zone they are around Level 10, maybe slightly higher, while the zone that borders Mulgore, Southern Barrens, is Level 25+, while the intended next zone for Tauren (also for Orcs and Trolls), Northern Barrens, is easily accessible from Durotar.
So, make Flight Paths between all capitals automatically learned.