I'm not signed up for cryonics. Partly, this is because I'm poor. Partly, it's because I'm extremely risk-averse and I can imagine really really horrible outcomes of being frozen just as easily as I can imagine really really great outcomes - in the absence of people walking around who were frozen and awakened later, my imaginings are all the data I have.
I'm sorry for your loss and that of your girlfriend, and I wish her grandfather had not died. While I'm at it, I'll wish he'd been immortal. But there are two mistaken responses to the fact that human beings die: one is to tout death as a natural and possibly even positive part of the human condition, and one is to find excuses not to deal with it when it happens. Theism with an afterlife is the first thing; freezing the dead person is the second.
In all likelihood, if and when I stop being poor, my bet and the money behind it is going to be on medicine, and maybe uploads of living people if there are very promising projects going on by then.
OK, you're risk averse. Specifically, you're scared. If you put a bit of imaginative effort into it you can play out scenarios of awakening into a dystopia, or botched revival, or abusive uploading, or various nastiness. Fair enough.
I propose that you haven't stretched your imagination far enough.
Staying in doom-n-disaster mode, what are the other ways you could suffer? Illness, madness, brain damage, disability, mistreatment, war, famine, plague, loneliness... it just goes on and on.
Switching to happy mode, what are the good scenarios? Love, long life, we...
My girlfriend/SO's grandfather died last night, running on a treadmill when his heart gave out.
He wasn't signed up for cryonics, of course. She tried to convince him, and I tried myself a little the one time I met her grandparents.
"This didn't have to happen. Fucking religion."
That's what my girlfriend said.
I asked her if I could share that with you, and she said yes.
Just so that we're clear that all the wonderful emotional benefits of self-delusion come with a price, and the price isn't just to you.