I think most of us have the same problem, you played that first MMO and it blew you away, you played the crap out of it and wanted to move on to "better" things. But nothing can achieve that original feeling. As an "old guy" I played muds, then some slightly graphics games (gemstone on Genie or Compuserve) etc.. Drakkar was my first true Graphic MMO, think Ultima Online without animation, it was a top down view of a world (ad&d goldbox?) like combat system and open world (surprisingly this game is still going today). Then Meridain 59 and a few odd ones (one was based on the Gold box games but I forget the name). Ultima online was "almost" it when it came out, it was such a good mix/blend. But then EQ came out and we went real 3D, there was real danger (besides gank squads in UO). The griffins in the commons, the PLAYER made market in the tunnel, playing a human with no night vision in the dark (and not cheating by cranking your contrast or tint). Running a level 10 form one side of map to other for MONK quests (was all but impossible). that game was "oh wow" and such all the time to me, it was something I had never seen, and playing with a few friends made it a game experience I would gladly pay good money to repeat. The problem is, like so many things you do for the first time, it very hard to repeat that. EQ was massively flawed, and now days is as close to unplayable for me as it gets (and the fact they have simplified it didnt help). But we all didn't know how massively flawed it was, nothing was like it at the time. Now there are many many games in the same vein and some do some great things, many are done much better, but they are all "second" or "third" so they are not new, they cant evoke that original feeling again. But all us MMO addict are still looking for the feeling we had that first time.
I still love playing them, but as so many here have stated, once it gets past that new game suck you in with wonder" the game is same old same old. Probably not a bad thing, EQ had a "played" time command when I gave the game up (7 years of playing it) i had a played time of over a year and half.. I had a great amount of fun, but its really damn scary to think you take a full time job, sleep, and subtract that from 7 years, take the free time and subtract another year and 6 months.. I fit the stereotype, get out and see the sun dammit!
good luck finding a gem that hits you like the old days, and let the rest of us know.