This is the curious thing I imagine that you have like a resonant voice... this is my pure imagination here, and I'm probably wrong, but just based on your stories and such, I just imagine that your voice is one of your stronger qualities... I bet you have alot of range.. and that when you are delighted, your voice really resonates with this emotion and you are able to transmit this enthusiasm to the other person. I just don't think you are a loud talker or have a voice like the nanny, the last thing you sound like is nasally...
Anyway have a wonderful evening...