Definitely, JuJu. My dad spent 6 months in ICU with severe acute pancreatitis, which his GP missed, before having his machines switched off. During that 6 months, I saw the mental and physical torture he went through - he begged us to let him die.
Last year, I lost a friend to breast cancer aged 38. She knew she was going to die for a year. She knew she wasn't going to see her children grow up. Watching her go through it was torture.
8 years ago this week, I was car jacked at knife point. While it was happening, I actually experienced the sense of "this is where my life ends." In the weeks following, my GP at the time told me I needed to put it down to "Fifteen minutes of bad luck" and move on. People told me it was a one in a million chance that it had happened, as if it should be some comfort, but it only served to make me think that if that could happen to me, ANYTHING could happen, no matter how remote the chances.
I don't even think it's death itself that frightens me, more the process that takes you there.