They are not billions of voices working as one, they are billions of voices forced into submission by some undefined force.
Forced into submission AND working as one, governed as we repeatedly informed, by the overwhelming desire to expand and assimilate.
To be frank, Locutus was not aware of the Queen because of the lurching great big "WTF?" that the whole notion of the Borg Queen was to the concept of the Borg Collective when she was introduced seven years later.
As soon as they introduced her, not only did the Borg get infinitely less scary, since they had a figurehead whose defeat would stop their plans though they seem not to miss her when she dies repeaedly, but they gained a human(oid) fallibility when she starts doign things like dicking around with Data.
And if she IS the Collective whey do we repeatedly have drones and the Collective telling her things, if she's the Collective, then she should know already, plus if she IS the Collective she serves no useful narrative purpose that couldn't be served by a disembodied voice.
Sorry, but when you need to get to the level of "they are not what we think they are", when all they've done for half a dozen years is tell us what they are at every opportunity ie a Collective which assimilates, and where no drone is irreplaceable or more important than any other, then suddenly one of them IS, then you've changed the fundamental concept to the extent of, IMHO obviously, derailing it.
They are no longer the scary, impersonal, Collective, they're just another alien armada with a sexily clad chick in charge. Been there, done that...