Assuming there is an afterlife, I would have to say everything about my place in life right now, which, when you think about it is to be missed even if you DON’T die.
In other words, instead of dying, imagine being transported a thousand years into the future, or being kidnapped and taken to an alien planet for the rest of your life…
I would miss all the little and big things of life. My home, the natural world of the earth, the beauty of nature and plants and animals, my particular culture and all the things I buy every day/week/month/year of my life. Being able to drive, to surf the internet, to play games, to watch TV, to cook, to talk to people, to paint, to read books, to listen to music, to wear the clothes I like, to see/smell/hear/taste/touch the familiar….
All the experiences of the now, which are embedded in our culture and time and place in history are essentially irreplaceable.
How do you enjoy life when your entire surroundings have been totally altered, either as a disembodied spirit, or as a zoological exhibit on another planet?