Like you were talking about above I can listen to multiple conversations at once but with no negative side effect. When I was little I would freak people out in the car because I could hold a convo and listen to the talk show on the radio. Mid convo I would bring up something the guy on the radio said and people would look at me like "WTF how did you hear that also". I guess unlike you from a very young age I knew this made me a bit different from most people.
This "ability" is also fueled to even greater heights because I have an extremely good memory. These two things together allow me to cross reference experiences and information. I believe it's faster then most since I can do more simultaneous and with a large pool from which to access information instantly.
I will say I really thank you for this post. I've really never read about anyone else who experiences this. I know we are not alone! I'm also really glad I'm not as a perfectionist as you I never thought about how that would affect me.