You will have people wanting to lick the box art within an hour.
I do miss TBC, not for the raids, dungeons etc but for the people I played with which have moved on from the game, some returned in Wrath and still play.
I will add a little story about release day, it was snowing here a real blizzard and I live quite close to my friend so I made the walk to the store and bought two CE's, got home played it for a week together levelling up really fun time.
I remember playing whack-a-mob on Hellfire the first day(well that after 1+hour queue).
5 guys for each spawn spot (not kidding at all) waiting for the poor demon to raise the head to be insta-tagged(people AOE spamming).
Im pretty sure they didnt worship Sargeras for this! lol.
I guess in PVP servers that day Hellfire was like the real battle for the end of the world with dozens of players every few square meters(you can laugh of AQ opening event)...and then Blizzard learnt the lesson: two starting zones(wotlk,cata) or heavy phasing(mop).
Some guys enjoyed it,sure....I was not one of them.Its not fun to stand in a place AOE spamming to kill 10 mobs in 20 minutes.
Then the weekend came,population spread,and we could enjoy the best expansion blizzard has released(and its not pink tinted googles nostalgy and novelty,im a zero day player so if its all about nostalgy I should be talking about vanilla).
Ahh.. my first midnight opening event. The entire mall blasting some WoW music, with hundreds of people in queue, so goddamn epic. Had some really good times in that expansion, too bad my guild disbanded in early wotlk. Loved those guys..
TBC, I started playing only a couple of months before release and TBC has a lot of good memories: raiding, being in a nice guild and the wow experience was good. I guess I'm one of the few who really liked Karazhan!