I concur. The real question will be whether it stands the test of time - both in the content available but how future patches add on it. I remember people praising WoD and Garrisons early on - only for them be be pretty universally reviled. (I was one of the people who liked them early on.) Here are a few elements that I really like from Legion so far:
* Scaling Zones - This was a much bigger deal than I thought it would be. When leveling, there was always a tension between finishing a zone and moving on to the next. Once you out leveled it, players are incentivized to move on (better XP, gear rewards, etc) over staying and finishing the zone. Additionally, scaling allows us to play the zones in any order we choose. Even so, they managed to craft the story in such a way that zone order didn't matter, either.
* Class Quests - I really missed the class specific quests, and now we have an entire campaign centered around it. It feels so much better to be (in my case) a Paladin doing Paladin things to progress the story than be a generic adventurer / champion / hero where it doesn't matter if I wear plate or cloth, am a holy warrior or a scoundrel. Also, I can't speak for other specs, but as a Ret well... Ashbringer.
* World Quests - I've only had them unlocked for a couple days, but I like them (so far). They're so much better than daily quests (one reason I didn't renew at the start of MoP is because of all the dailies.)
I do have some concerns (gaining crafting recipes feels very opaque and unclear, but more entertaining when you do them, I worry a bit about the world quest becoming a grind, Class Halls are better than Garrisons - but could be problematic, and Artifact Power / Relics makes it harder to decide what to do with offspecs & alts), but so far, I'm impressed.
Yeah, I have a lot of fond memories of Vanilla, even though the state of WoW (by modern standards) wasn't that great. The social aspect and the sense of wonder were very strong. The world being large and mysterious is pretty much impossible to recapture now. Even without sites like Wowhead data mining everything, we've been around the block often enough to see through the illusion. Sadly, once that happens, you can never see the world quite the same way again.
Yeah, the DPS queues are pretty brutal. Though, the handful of times I've had a zone ending quest requiring a dungeon specific queuing has given me a near instant pop. It only works once (quest complete), but still.