And that's what was great about KZ. It wasn't about enrage timers (which should be all removed from raids altogether unless it is purely patchwerk fight), wasn't about 20-page booklets per boss you must read. It was about layout, atmosphere and having fun with friends.
That's why that raid became so memorable.
Alas, with current developers, we will never ever see anything like Karazhan again. Best they can do is to make million of difficulties and millions of subtiers, which makes raiding even less appealing, whlie trying to keep catering to people, who shouldn't ever touch RPGs in first place.