Why does my corgi dog Bernie barks every time someone comes to our front door, except me? I feed, brush & pet him everyday but never a bark.?

Quite the contrary, you dog may actually recognize and probably respects you as an owner/pack leader which is why he doesn't bark at you.

Corgis were not only bred to be livestock and family dogs but also intended to guard the property. They are alert barkers by nature so they will naturally bark at strangers when they first come until they've established whether or not you view them as guests or as a threat. As for you wife, maybe he's letting you know that she's coming and going, or just a little more excitable to see her, who knows? :) I'm sure it doesn't mean that he doesn't like you. My own corgis will bark at anyone, us or strangers, if they come in and out of the door. It's just a natural corgi trait.

How is this a bad thing? Your dog knows you. You are her pack leader. Barking is alerting you to someone else being there.

... no point in barking when she already knows that you know when you are there.