Whether you are of the opinion of "doctor knows best" or "natural and intervention-free" it is always good to have a birth plan. Are you already tuning out to this entry? You say, "there's no point, I can't control the outcome." or "I don't like to over-think things." Sure, it's true you can't always control what your baby and body decide to do, but a birth plan will help you think through different scenarios and prepare you to react confidently when those unthinkable scenarios arise.
Don't feel comfortable taking drugs? Then plan on learning other pain-coping techniques and decide what scenarios you would feel comfortable using drugs.
Want to have an epidural? Then think about when you want to get it. Having it at the beginning, middle or end of your labour all have different pro's and cons. For example, if you get it at the beginning you will have pain relief early on, but if you wait longer you will be able to continue to eat and drink, which will give you more strength later on, and you will have more movement which could help progress your labour.
I'm not here to tell you what to put in your birth plan. Perhaps you want to labour at home as long as possible, or you prefer to transport to the hospital at the first signs of labour. The best path for you to plan on is the one that makes you and your partner feel the most comfortable.