If the Gender Binary works for you, fine. I have no problem with you taking that personal position.
Personally I feel that it allows for oppression by patriarchal heterosexual males, to the point where it has become so all pervasive that those who don't fit in still are trapped by it. They are gaymen and lesbian women, for example.
Transsexuals have a chance to operate outside this mindset.
I prefer to think of a space with lots of opposite poles around it's outer edge. Opposites like male/female, gay/straight, masculine/feminine etc.
We would be free to move around in this space over time, so we can see that we are actually changing in many ways during our lives.
I find it's fuzziness reassuring too in that I don't have to define myself exactly, and am not expected to.
Karen. (who seems to be turning into a radical feminist?)