From reading your post I get the feeling that you do not like investing hard time into getting gear. Yes, Aelli is or was getting farmed, but that could be because the whole game has changed since WotLK. If you feel that you cannot invest the time to get good at quad boxing, stick to playing a single character or quit. Multiboxing is not something that everyone can do as soon as they set out to do it. You have to do things 5 times over sometimes, or 4 in your case. Getting gear to do stuff is going to take "5(4)" times as long 'cause you have to get all your toons to do it.
Everything about Multiboxing screams, "Time invested into the game will increase".

So I ask you this, are you looking to spruce up the game for about a month, or get serious and try to get good. If your answer is the second, be ready to invest time into a game and get the skills required (from which you said you don't want to do). Instances can be multiboxed, I feel almost all of them, you just have to be that good, and be able to control multiple characters extremely well. If your answer is the first, then don't bother.

FYI. The cheese is when after dieing many times trying to kill a boss, you finally do it. It may be sloppy, but now that you have done it once, you know with more practise/gear, you can get he/she on farm.