OP, I might have missed it, but do you know if you're the only recipient of Photo Overload, or are there others? I'm asking because I agree with the majority here, but if he's really a close friend, you might want to mention to him that he risks driving people away. I actually cringed reading part of this!
I was in a similar position with a good friend. I don't think she ever held people hostage in a restaurant forcing them to look before eating, but if you got invited to her home, she'd hook the camcorder up to the TV and you'd get to see trip photos. The last time she did it, there were like 25 photos of ONE hibiscus - complete with commentary on each photo.
People started declining her invites, and it was sad, because like your friend, she was awesome otherwise. It wasn't the easiest convo I've ever had, but her parties were going to be just her and me if someone didn't say something.