Perhaps if you actually read the list you'd see it is a selection of options to choose from rather than a very long list - you can't have a natural AND a managed third stage now can you? 
I've actually looked Titty's list and none of the items actually take the midwife any more time - some actually create less work. To illustrate this I have annotated below.
The only difference is the midwife has to read the plan at some point (part of her job) and check with you/birth partner if she can't remember. This is her job. If she's too busy to read a birth plan and check on your preferences throughout labour you are in a dangerously understaffed hospital.
Unless you are suggesting all women should have labour induced, forceps used, CS if they don't progress within a few hours and a managed third stage for speed, your post makes no sense.
Telling medical staff what you want in advance saves them time. Of course there are situations where the plan needs to change. I refer you to my other posts on this thread about informed choice and feeling involved in your care.
I am indignant that so many people seem to think that expressing a list of preferences to do with you body, your baby and your birth at one of the most intense and sensitive times of your life is unreasonable and should be a requisite of highly expensive private care. I am sorry that your experiences of the NHS have made you feel like this but you are wrong.
I am bowing out of this thread as it is making me too cross and I always vow never to be cross on Mumsnet
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I want an active labour so please encourage me to move around if I?m not too tired. likely to make labour faster
I?d like to be left to get on with doing things in my own way as much as possible. brilliant for a busy midwife
No internal exams unless clinically indicated/ until I feel ready to push/ unless I request one. again less work
If I have to be continuously monitored could you help me to maintain as much mobility as possible. part of midwife's normal job
If I need interventions could you please explain very clearly what you want to do and why ? to me if I?m able to listen, or to my partner if I?m unable to listen or speak coherently. this is the law - you have to seek informed consent
I?d prefer to get through the labour without pain relief and would like lots of encouragement and support to achieve this. midwife's normal job.She should be encouraging and supporting a woman in labour
If I?m not coping I will request pain relief, but I would prefer you not to offer it to me.
OR
If you think that I need pain relief ? I look like I?m not coping - could you offer it to me?
OR
I?d like an epidural /pethidine as soon as I?m in active labour.
helpful for midwife to know in advance pain relief preferences
If changing position in second stage will help me get my baby out more easily, could you strongly encourage me to do this?
again a good midwife will do this always
No directed pushing unless absolutely necessary. again less work
I?d like to use the pool for pain relief if it?s available. woman's right to birth as she chooses.helpful for midwife to know in advance that pool might be requested.
I would like/don?t want to deliver my baby in the pool if possible. v useful info in advance
I would like a natural third stage if it?s clinically appropriate. woman's right to choose and again useful info in advance
I would like my partner to cut the cord/my partner does not wish to cut the cord. helpful to know in advance so they don't assume and cut themselves
I don?t want the cord to be cut straight away if possible. again sueful in case they don't often to natural third stage and need to be reminded
I?d like my partner to catch the baby if the birth is straightforward and the midwife is happy for him to do this. ^
I would like a managed third stage. useful factual info
No medical students/I don?t mind if a medical student is present. women's right to express this and saves midwife time in asking
I?m happy/not happy to have a student midwife assisting my birth. as above
I intend to breastfeed and would like to hold my baby straight away. If it?s not possible for me to do this straight away and my baby is well, could my partner be encouraged to have skin to skin contact with my baby instead? very moderately expressed piece of essential info
My birth partner is squeamish/anxious/wants to be fully involved. again saves midwife time in the long run
If I need a c-section I don?t want/I want my baby cleaned up before I hold him or her in recovery. useful factual info
If I need a c-section could the screen be lowered as my baby is lifted out? useful info, saves time on the day
We don?t know the sex of our baby and would like to discover it ourselves rather than be told. vital if you want this ot put it on the birth plan in bold. doesn't take the midwife any extra time at all