My baby loves to respond to his/her dad's voice and touch - it's nice and I think gives my husband all the confidence in the world.
I also don't really feel too left out of the equation since we have to remember - the baby is "with" us all day and so is probably way more adjusted to the sound of our voice, our footsteps, our background noise at work and in the car. Listening to Dad is something special because at least in my case he only gets a few minutes quality time per day.
Or maybe I'm waaaay overthinking this but what else is new :)