This is more of an opinion thing than anything, but yes, I think so. The zones are very, very large and have a lot of flavor to them. They are hand-made from start to finish with no random, computer-generated segments in them at all. Each one is simply gigantic, with tons of content packed into little corners and places just about everywhere. They weren’t joking when they said you’d stumble upon cool hidden things like high level monster lairs, random quest-givers that aren’t just standing around in town for everyone to see, and other easter eggs and events. The music helps contribute to the level of immersion the game provides, as does the well-styled artwork that remains crisp and graphically excellent for an MMORPG.
Thanks to this, I personally have found it very fun to explore the zones. Most everything in them has some sort of purpose for being there, whether to help contribute to the lore of the zone, guide you towards a Public Quest, or be a fun spot to romp through and see (one example being some statues with Tome of Knowledge unlocks of some famous Warhammer characters hidden away!), it’s all good. I rarely felt like a zone was “too full” and more like a small forest than an expansive valley with surrounding canyons, or a true area of land with enough mass to really exist on its own. You can and will find spots that the developers knew people would find just by exploring, and you’re going to find a lot of easter eggs hiding out for your efforts, from XP bonuses, to item rewards, to Tome unlocks, to plain incredible sights, there’s a lot to find!