I'm a PVE person at heart, but I'd ultimately sooner have one healthy population server than two fragmented ones. For sure it can be annoying to get repeatedly ganked by level 60s but I guess it's also a way of encouraging you to explore somewhere else to level, to call on high level players to come to your aid, etc. Despite having never really done much world PVP myself, I can see how it adds a certain level of organic play that you wouldn't otherwise have.