We're using "recyled" pretty loosely here. ZA is really the only one that belongs on this list.
Almost all the others were minimal reuse - a single name, lore figure, location, or map. As far as actual gameplay, they were wildly different. Nothing about BWD was the same as BWL except that it took place in the same zone and the final boss was the same figure in lore (but the fight was radically different). SFK, Deadmines, ZG, etc - all of these were the same map but completely new mobs, bosses and lore. Dragonsoul and the CoT dungeons were only recycled in the sense that they took place in existing locations, but again, completely new in terms of functional playing. Firelands was all new except Rags, who again was a totally different fight than original Rags.
I mean, I'm not going to laud the expansion as a pillar of effort, but at lot of these criticisms are using a way extreme definition of "recycled."