Your 7 years of no accidents means that you are going to survive the next 30 or 40 not having one?
You will have an accident at one point in your driving life, it may not be your fault, it may not be serious but you will have one and if there are any technological gadgets that can prevent that one time, then it is more than worth it.
I spent the last 35 years of my life driving without gadgets, but as soon as my wife got a 2016 Outback with eyesight, I loved it so much I went out and got a Legacy with eyesight, it really is that good.