I did a very detailed birth plan with my first (and only) and I second the vote that they're not just for FTMs destined for C-sections. I handed it to the midwife as she walked in my front door. I got everything on my birth plan - home birth, no pain relief, no examinations, no talking, no coaching, sit-in-the-corner-and-pretend-you're-not-there, I'll catch my own, thanks, no stitches, back to normal, MW out a half hour later.
Large helpings of luck of course, but the plan was important to me in that it made me research each issue and option, some of which I wouldn't have known were available if I wasn't going through the process in my mind and questioning procedures and my preferences.
I agree that a better name needs to be found for it than plan, however. I certainly don't think anyone needs to have a plan, certainly not a written one, but writing it down and making decisions in advance does make you think about what it is that you want. I'm not talking about the things you cant control - but it really narrows down the things that are important to you, whatever happens. To the OP, it sounds like you have that sorted in your mind already!
I'd make a birth plan again, certainly. I don't think it's a given, though. Horses for courses and all that.