Is this thread still alive? Oh, well... time for some corrections.
If you raid just because of loot, something is wrong with your head. If you think raiding is all about the waiting, go check your psychiatrist for ADS and learn to value the fucking community in your guild. If you raid because of the challenge of killing the next boss, you're doing it right.
Also, minor correction... most people don't realise this, but mechanics haven't gotten more complex. Blizzard's dazzling you into believing they have has become more complex. And the drones are successfully tricked into believing it. In fact, during WotLK or TBC - I don't remember exactly when - there was an interesting thread on EJ showcasing each boss using the same old mechanics they used in vanilla.
I'm almost 100% sure, I could break down every boss in ToT down to no more than 12 basic mechanics from vanilla raiding (apart from the occasional gimmick fight) and have ti successfully explained to a vanilla raider so he knows what to do. Don't let Blizzard distract you from the core of each fight with all the fireworks going on. A bomb is still a bomb, even if it's a ball of lightning, fire is still a bad idea to stand in, even if it's a purple pool of goo and a meteor is still a meteor if you limit it to one group of 5 people meeting up at a predesignated point etc.
The only thing that has increased is the number of mechanics mixed into one fight. But the number of overall mechanics used in boss fights has not increased by very much since vanilla. Talk to your friends about it. Make a fun discussion and try to explain every ToT boss with vanilla bosses, you'll see each fight is actually quite simplistic, once you look behind the fireworks.
Oh, for an advanced raiding group, try to think up new mechanics that are not gimmicks, yet so innovative that they can't be explained with vanilla boss mechanics. I always find it rather difficult. One reason why I'm fairly certain this will never change. There's only so much you can do with the given interface and platform.