Ego is a part of the human experience. Sometimes in AA, and in other schools of spiritual thought, we place it in a negative light (or, maybe that's just my interpretation of the light it is placed in?).
Speaking strictly for myself, I'm not sure the point is to try not to have one at all -- it is not a bad part of me, it is just a part of me; just like I have an arm, or a leg, and they are neither good nor bad but simply parts of me.
I believe (for me) the point is to be aware of my ego and then try to transcend it. To not let it be a driver but rather (to indulge a terrible metaphor) to have it be just a passenger.
To work -- using the tools of AA -- to be "right sized," that is, neither 'greater than' nor 'less than' in relation to others, the world, or strangely sometimes even myself.
My greatest successes in this endeavor have come from two things:
1. The repetition of a healthy message I hear in AA meetings (although that healthy message may be presented in an unhealthy way, meaning, some people are, as they say, shining examples while others are horrible warnings. I learn equally from those who inspire me to emulate a positive example as I do from those who caution me through their behavior to try to be nothing like them).
2. Prayer. Whether I am actually able to connect with the Divine, or it is just a form of mental gymnastics in which I am rewriting the software of my mind, doesn't actually matter. The result is what matters. And in dealing with my ego, prayer works.