Yes it's not easy to use, unless you have a high level enchanter stun locking the mobs
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As for AE Mez, I'm pretty sure that it was unlimited, at least during Kunark (didn't play enchanter in classic). It was targeted and you could mez yourself, and single mez would not stick over AE Mez so it was very situational (and it lasted only 24s I think?). Still, I sometimes had mez + ae mez + 2 ae stuns + root + slow loaded in XP groups, talk about massive crowd control.