I miss my first day in WoW.
I miss getting lost in Red Cloud Mesa (couldn't find the damn well)
I miss thinking you did more damage if you kept right-clicking the mob.
I miss running around the plains of Mulgore for a whole day trying to find that bastard Arra'chea.
I miss dueling that rogue in Crossroads who vanished into thin air making me think he fled the duel so I started killing a few questmobs when he reappeared and started beating the crap out of me.
I miss getting my first gray leather shoulders for my warrior, thinking I was awesome with them.
I miss saving money for that awesome-looking white vendor axe.
I miss not knowing squat about Auction House or how to use it.
I miss going to Booty Bay at level 15 with the intention of going all the way to Silvermoon because I wanted to train swordskill. (at least I made it halfway through Duskwood until I gave up)
I miss charging about in Wailing Caverns as a dps warrior without a clue that I was acctually wiping the group.
I miss picking up mail items with intellect and spirit, just because they had higher armor value than my old armor pieces.
I miss that the game used to be an adventure, unexplored, always more to see, always stuff you didn't know.
What now? Now I'm a half-bored old half-elitist doing my dailies and roflstomping 1, 2 or maybe even 3 random heroics each day just so I can get my emblems. Here's one hoping Cataclysm will make me a noob again, opening a whole new world for me. An unexplored world. A world filled with stuff I don't know yet.