Here is what I believe instead:
"you" are the countless processes running inside your brain, interacting with each other. When these stop, you're dead. When you're asleep, they interact with each other less, and "you" are reduced. When you're in a coma, they interact with each other much less, and "you" are much reduced. But when you're frozen after your brain activity has stopped, anyone revived out of your body isn't "you" anymore. It'll be someone else with your memories. The only benefit of this would not be to you but to your family and friends (if they're still here) or to projects you're working on but want to have finished even if you won't see the results.
I suppose there's a chance cryonics can be useful, but only if it manages to "preserve" someone before their brain activity stops (which CAN be after the person is clinically dead, e.g. heart stopping != brain dead), and their brain activity continues at a very slow pace, but continues nonetheless.