Assuming I did this and got the money and lived say another 20 years (taking me to 73) I would not have to work ever again, not worry about how to pay my bills ever again , have a pretty nice remaining life and still leave quite a chunk to my children.
If I died soon after then my children wouldnt have to work ever again, never worry about bills ever again etc.
But my children are grown up, if they were younger I wouldnt take the option.
It's not about things I can buy, I currently buy the things anyway. It's a comfort that money at least isnt a worry, a lot of things can be solved/minimised by throwing money at them.
I don't see that my life would alter so drastically with as you say not all that much money, but no longer setting my alarm, no longer dragging my currently peri menopausal self into work. I could do much lovelier things with my time.
I wouldn't even move house, I still wouldnt buy a car, I've done my travelling for now, have no grandchildren yet nor likely to. Just that money sitting in the bank would give a sense of calm <<<wrong word but cant think of better.
And If my life ended soon after, well, I had a good innings, I'm happy with what I achieved til now, I was always going to die and my children are set for life.