I am a StarTrek fan. I just question the show writers use of plural pronouns. A collective consciousness without a concept of individuality wouldn't say "We" or "Our". A collective consciousness wouldn't realize that is is many minds. It would think and speak as one mind and would say "I" and "my".
It's probably taken from distopias like Anthem and We where individuals used third person pronouns to refer to themselves as they were part of an extreme communist collective and had no understanding of individuality. I can't recall the extent to which this was used in We but in Anthem the main character's discovery of 1st person pronouns was critical to his understanding of unique personhood. I think the writers were probably trying to portray a similar lack of understanding.
If you think about it, what's more powerful... a borg who says "I" but means it in a collective way or one who eschews all personal references in favor of the third person? Can you imagine how difficult it would be to even have a conversation with someone like that?
If you were correct in your assumption that the Borg are a single mind. Your cells do
not each have their own conciousness like each drone in the Borg "hive". That's what youre misunderstanding. A hive mind is many working as one. It
is proper for them to refer to themselves as we.