Yeah, I was wondering the same thing the first time I saw AotC three years ago. We have their first scene in the elevator, and they're reminiscing, and I thought, "Okay. Now we'll finally get to see the relationship that Old Ben was talking about, something we didn't see at all in Phantom Menace." And it wasn't so much that they were separated (I noticed that they were separated much more in Sith), but the time they did spend together, they spent it fighting and annoyed at each other or saying crap behind the other's back. "You will learn your place, young one." "In a lot of ways, I'm really ahead of him." "It's all Obi-Wan's fault!" And then all the times that Anakin disobeys Obi-Wan towards the end about saving Padme and fighting Dooku. There are a few lines, like, "Don't say that, you're like a father to me," but it's just too little, and, like you said, it's just expository dialogue. It doesn't show anything.