Yes, I agree. A vote of zero doesn't really express apathy. It expresses a non-positive opinion of a ticket. It also represents a non-negative opinion. (I merely framed my original post that way since this question is so ripe for ironic interpretation.)
There are some cases where I feel a ticket creator has a valid concern, but wish to express that I do not share that concern, without having to say that I'm opposed to it. In these cases, my vote of zero would mean to me, "Neither supporting nor opposing."
I've often wished I could vote zero to accompany a comment I wrote that says, "I agree with your concept, but I do not agree with your suggested implementation." or "I think your point is valid, but any benefit a fix could provide would be trivial." In those cases, I usually vote +1 or -1, but sometimes, my net opinion really is closer to zero. In these cases, my vote of zero means something more like, "Equally supporting and opposing."
I understand if there are technical reasons why a vote of zero cannot be supported, but if it can't be done, I think it would be good just to take zero out of the scale, and place a link under the voting scale that says "Retract my vote."
The way it currently appears, that tantalizing zero just keeps taunting me. ;)