I think you two are misunderstanding each other, You're assuming he meant race changing to worgen/goblin. I'm pretty sure he was more thinking about race changing to an existing race (like troll druid/ tauren pally, etc.) In that case, technically he's right. Youre still leveling from 80-85 like everyone else.
Personally, i'll be race changing my drood, not because of any achievements or to 'rush content', but because i love the class but don't like my tauren that much.
I will be leveling a goblin from scratch as well ^^