I don't think all of the TBC heroics were tough but some of them... Shadow Labs, Hellfire Whatsitcalled... not Ramps. Not Blood Furnace. The other one. xD Those were kind of challenging. I remember Ventrilo being a thing for some of them. And I remember CC before every pull and so on and so on.
Anyways I liked the TBC/WotLK zombie event, I thought it was a blast and I don't remember it being particularly disruptive at all. I don't think any of my alts were affected, really. By the end it was really neat because Stormwind was a warzone straight out of a zombie movie. And I got a special tabard and an item in my inventory that makes a ghost appear every so often. Still got those! Wish I could get that tabard at the tabard vendor though so I could have it on other characters.
Anyways I've been a bad, baaad person since making this thread like a year ago and I've been cheating on WoW with other games. I really only log in for garrison stuff these days and then bail, haha.