I wouldn't call you insane for for only wanting L&D, but do keep in mind just because you loved/hated something in nursing school does not necessarily mean that you will love/hate it once you're in the field. I've seen many new grad hires that went to nursing school just for l&d, and were out of there before their one year anniversary hit. I've also seen nurses that hated l&d, wanted no part of it, and that's where they ended up settling. I was one of the haters, but it just so happened that l&d was where I ended up fresh out of school. I never would have believed it would be my passion.
As far as saying you don't have to have med surg experience, no you don't, but it makes life much easier. OB nursing in itself can be overwhelming when you are coming straight out of school and learning to be a nurse, not to mention learning the specialty area aspects of nursing. I say yes, l&d is a specialty area unlike many others, but you still have to deal with sick mothers and the effects of it on the baby. It's especially helpful if you do decide to ever work in a high risk setting because you're already familiar with the disease processes, and then you can apply it easier to mom/baby. Experiences vary, and what I've found is that if you're in a large hospital as a new grad, you will have more of a support system than a new grad in a smaller hospital. If you're in a small or more rural hospital, it may just be you and one other nurse on nights, so you're going to have to get it faster....keep that in mind.
As far as rather or not you should take NRP or any EFM courses, I would advise you to wait. Until you see it and are around it, it's not going to really make a whole lot of sense to you. By all means, you can get resource books and be familiar with the terminology and even your basic strips, but I would wait to see if it is something provided by your facility.
As far as how to get into the field, all of the new grads at the rural hospitals I worked at started out on post partum and harassed the manager from there. The larger hospitals hired new grads that applied, called, and made surprise visits to the unit to see the manager. Sometimes, HR may or may not forward the applications without experience. Good luck with everything, and I hope you end up where you want to be!! I'll also pass on the best advise I was ever given when I started work...it takes 2 years to feel competent in l&d!