AE paci (wake of tranquility) is still 7 min duration, but it has a much higher mana cost and a much longer re-use cooldown which you can't skip with a top slot GCD reset.
Sometimes you get lucky though, and it actually hits 3-4 mobs you want to all be pacied, and it doesn't get resisted. In those rare cases it's actually more mana efficient and quicker than regular paci.
More often than not though, it's a headache and you get unpredictable crit resists on mobs you didn't even know you were gonna hit.
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