Nirgon's point is spot on.
The primary use of AE slow is to draw the mobs away from enchanters and put them on a torpor shaman that can tank them while the enchanter mezzes them up or some other class roots them.
It's even better on a raid than it is in a group if the puller brings too many to camp.
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Fingon, 60 Druid, <Taken>
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