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That study shows (as per Wikipedia):

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Another study in 2004 found that ZMA has no effect on strength or hormone levels, but did show a lower rate of muscle catabolism and cited further study was recommended.[3]

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That's pretty much what most people here are echoing - lower rates of muscle catabolism is pretty damn effective for people who are cutting, and that almost certainly relates to recovery time.

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If it did indeed decrease rates of muscle catabolism, then I would absolutely agree that this was a worthwhile supplement. Maybe I'm missing something, but after reading through the results and discussion section again, I don't see where it comes to this conclusion at all.

From the discussion section to that study:

"The major findings of this study was that dietary supplementation of a commercially available ZMA supplement resulted in a non-significant 12-17% increase in serum zinc levels but did not appear to affect anabolic or catabolic responses to resistance training, body composition, or training adaptations."

There might be a small, favorable trend in regards to body composition according to the paper, but the data they found could easily be due to random chance. The authors found the changes "not statistically significant", and they contend that further study would have to be performed.