Well I think I have gone too far in this one to switch now. I do get a bit bored because it is so immense and almost everything you do just seems like a rehash of everything else that you do but I guess that is just the way these games are. I can't say that I will finish it because yes, it is really long, but it's a decent time sink for now.
The problem I am going to have is that if I decide to switch over to something else I am going to forget the controls... which is something I tend to do regularly.