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From what I've read (and trust since I'm not a math guy) we gain little if any benefit from increased haste, as our lickey-split 1-second attack speed is just about as fast as it gets.
Not entirely true for this reason. Haste DOES affect attacks to bring them below the 1s mark. Why it's not great for druids is that haste only affects our white attacks. Most damage in cat comes from specials, particularily bleeds. White attacks making up only about 30% of our total damage. So the haste only causes an increase on that percentage. Other classes, such as contemporary rogues have around 50% of their damage from white attacks, giving a better pay off for the invested haste stat.
Or so sayeth the number crunchers posting on the ElitistJerk forum and WoWWiki site.