As a maternity RN, we joke all the time that the patients that come in with detailed birth plans always seem to end up with C sections too! Not that it is funny, but it really does seem to happen!
Personally, I don't care for a birth "plan". If there is one thing I have learned in my years of nursing is that there is rarely anything "planned" about labor. I understand that people want to express their wishes (i.e. no drugs, want epidural, want to walk around, don't want IVs, no episiotomy, etc.) but much of this should be discussed with your doctor ahead of time and many of the things you think you either want or don't want change once you start labor. Also, some of these things are beyond your control to some extent. For example, you may not be able to walk around while in labor in certain circumstances or you may need an IV for medical reasons.
Some of the things written are often things that we do automatically, like let you hold the baby as soon as its born (assuming the baby does not need immediate medical attention).
Many of our patients are highly educated and have jobs where they are used to being in control. Labor and delivery can be very frightening and I understand that a birth plan can give a patient some sense of control over a process that can seem very out of their control.
For those of you unfamiliar with birth plans, they are a usually typed sheet or sheets of paper detailing what the parents want to happen during labor and delivery. They usually state things like they want a dark, soothing room, want to listen to soft music that they have brought, want to be able to walk around, want an epidural, want to breastfeed immediatley after birth, etc. Some can be very very detailed!