Yeah, it doesn't bother me too much that the aggravation still gets to me. One of the drawbacks to my current job is that I'm isolated much of the time. We keep in touch with each other during the day using email and IMs, plus the occasional phone call. In my previous job I had colleagues whose offices I could go into and vent away. Now, I have ONE person (at the moment) who I can call and rant and rave to, and he TOTALLY understands. I'm not as close to the other people--there was one other person, but she left to go out on her own. I still call her once in a while and still rant and rave about my experiences with this one individual.
Much of the time, I find a good vent gets me to the point where I'm not carrying around anger and resentment. I HATE feeling resentful. But I really do need that pressure relief now and then. It's a lifesaver for me.