I'll tell you how it is with Keefer. Whenever I'm home, wherever I am, he is. When I'm in the office on my computer he's usually laying right behind my chair, and if not he's somewhere in the room where he can see me. (Just now I turned around and there he was, looking at me. I said "hi, baby" and he immediately got up and came to me.
If we're in the living room watching TV in the evening he's either on the floor at my feet or across the room where he can see me. In the morning when I'm in the bathroom taking a shower and getting ready for work he's laying in the hall where he can keep an eye on me.
If I get up and walk out of a room he follows me. Every single time. I don't need to say a word or even look at him, he just gets up and comes with me. If he's watching me and I hold out my arms he immediately gets up and comes to me for some love, no matter what he's doing or how tired he is.
When I'm not home he doesn't always hang out where Tom is, he waits for me to come home. He gloms all over Tom for affection, and has been draping himself across his lap for hugs since he was young. I don't allow that, and have never reinforced it with my attention, so he doesn't do it to me. When Tom is laying on the couch he'll go over and lick him all over the face.
But no matter how much he loves Tom, and he clearly does, he loves me more.