To try and steer this interesting discussion towards the topic, here's a different perspective:
I don't play games for the pve or for the dungeons/raids whatever. I play mostly to explore and see new and interesting stuff. I played the shit out of GW2 until I had been in every area, done almost every dungeon (they all have more than one path, and I didn't do all the paths), and explored the WvWvW till I was reasonably satisfied. Most of the time I ran around trying to get to places that weren't special, except that they seemed hard to get to. I also played WoW for a bit, and I kind of enjoyed the immersive things you could do. The relatively new archaeology profession was one of my favorites.
Both worlds were huge, but sadly, both offer little mystery in terms of exploration. Sure the decor was cool to see, as were new mobs (occasionally killing them). But both worlds were made to feel small - in GW2 thanks to the instant-teleport, and in WoW thanks to the flying mounts. I mean, there was little challenge to explore when you could just teleport around or fly over all the areas. Not to mention neither game had that much besides killing stuff.
That's one thing I'm hoping they do in EQN - exploration. Fully destructible terrain could add new ideas - like say treasure maps that point to places you must dig. The deep cave system they showed in their video would also be something interesting to explore, especially since they say it will procedurally regenerate on occasion. So, the caves could hold something new for me to run around in, and see what cool new things spawned (treasures, or unique mobs or something). Maybe I'm hoping for too much, but there's a ton of things they can do with it.
There's gotta be a nice comfy middle ground between the total roller-coaster standard mmo experience, and the completely free, yet having little uniqueness game (like minecraft). Something that gives you freedom, but can have a sense of mystery and uniqueness to it. I'm hoping that EQN hits that spot, because I've been running out of things to explore lately :) Of course it's going to be a while, and they may not do anything like that - well, I've still got some hope (and other games still to see, like Wildstar)