Volume and demand can be very different, though, so doing /who all might be misleading.
I find using "/who all lfg [class] [level range]" was effective in showing you what kind of demand there was for any class. The lower the number that popped up, the better the chance at finding groups with that class.
This is not exacting, of course, but will give you a decent idea if you do it multiple times over a couple nights.
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