I’m about 5% away from level 93 now, and still loving Shadowmoon Valley. As a zone it is well put together. The rares spawn often, they drop interesting and sometimes useful things, the monsters are squishy enough (especially if you overgear the zone), and the travel time between hubs and quest locations is enough to get you “into” the zone and exploring without being tedious. There are the odd special things found along the way, like the quest to kill animals for steaks, or the special events for the garrison.
It is also a little morbid to look at this zone and think about what we know of the alternative from our character’s own timeline. I can see parallels in the geography and that helps make the story’s impact stronger. I wish I was able to level faster, but not at the cost of missing the experience.