OK, I am a big fan of OOD. Why? Well, it makes your life easier. Yes, it can be a bit harder to understand and grasp what's actually going on, but the payoffs are immense. Once you get into the concepts, you really see how it's just logical.
If you want to know more, read http://blog.objectmentor.com/ArticleS.UncleBob.PrinciplesOfObjectOrientedDesign