In my honest opinion, I'd kill to have a Naxxramas-like attunement. Quick and fairly easy. Get the mats (or none at all, depending on your reputation level) and tadaa, attuned. Maybe throw in a quest in a 5-man / 10-man dungeon if that's not enough. Nothing overly taxing like "go to instance X and kill Prince K and Lady V" who are 25-man bosses. Perhaps I'm lazy, who knows, but I sure hate having to backtrack to older raid instances and waste an entire raid day which could've been better spent on progression content.
A 5-man / 10-man + mats turn-in attunement wouldn't / shouldn't be bad at all and can be done off-raid hours. Well, that's my personal preference hehe.
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Editted Portion :
A half-joking ytmnd as to why raids usually get stuck on raid content. ^_^
http://kaelthasraiding.ytmnd.com/