It's been awhile since I've posted on this topic, but I wanted to add some information.
I started a new game, and after it had been played for awhile, the same thing started happening -- exceedingly long load screens. However, I have an old gaming desktop that I decided to get running again (it had hard drive failure and since I have a good laptop, I decided to just leave it be). It definitely exceeds the recommended system requirements, and while a few things do run much better on it, using the same saves, it also has very long loading screens.
I don't think it's the issue of the computer. This machine, while older, runs most things much better than my gaming laptop. I think it's an issue with the saves themselves getting bogged down. I hope it's something that can be fixed.
This computer also is using an SSD. The graphics card, a GTX 560 ti, is a better card in all benchmarks by a good margin than the recommended GTX 650 ti. The i7 chip is first generation, but it is a quad core chip. There is no reason at all this machine should have issues with long load times.
I really hope whatever is causing this gets fixed, because I like the game, but I don't think I like it enough to deal with several minute long loading screens to go anywhere.
http://pastebin.com/5Te7a3ae