Haha, no worries, your no more insane then the rest of us I'm sure
My Angel, Plattys, and Dwarf Gourami(and Honey Gourami when she feels up to it)all respond to me approaching their tank and walking about. As all my tanks are in my room, I'm usually greeted with the site of my Angel and occasionally the others swimming around the side of the tank closest to my bed in the morning, becoming more excited when I actually get out of bed.
I do talk to my fish, but by the time I do talk they're already all excited that I'm by the tank
. I'll have to try that out and see if I can get them to respond to just my voice