Let’s imagine you do end up floating through space after the sun does its thing and explodes. I may not be an expert on the human eyes or star explosions, but I’m pretty sure too much light would cause you to go blind, and I’m also pretty sure that watching a star explode would be blinding. I also think the noise might cause you to go deaf but I’m not as sure because I’ve never personally heard a star explode while floating in space so I don’t know much about the physics of that stuff
So now you can’t see, but you’re still floating in space, forever, with no control over your direction or anything. Suddenly, every day does become the same, you have nothing to see, nothing to hear, nothing to taste or smell, all you feel is constant, never ending, intense pain as you float around hopelessly, eventually spiraling into complete insanity.
Doesn’t sound very fun anymore, does it? You would get sick of the chocolate cake. Even if one day something changes slightly, maybe you get hit in the nose with an asteroid, maybe you end up in a distant planet’s orbit, those little sprinkles aren’t going to make that chocolate cake any less sickening.
I would just like to say AGAIN that you cannot tell me how I would feel about immortality and floating through space for all time because, as I explained before, I think it would be damn cool to see all that stuff. I love space and the like so I cannot see myself getting bored of it.
Now, just so you know, there's no sound in the vacuum of space unless there is a medium for it to travel through (like oxygen) so the second I started floating around the void I'd pretty much be deaf anyway. Who cares? I don't. Why would one need to hear in space anyway? There's no people nagging at me. Also, if I'm immortal it means that my cells cannot/will not deteriorate and die, meaning that even if I stared into a supernova and my eyes got vaporized, they would just heal back to how it was.
I'm getting annoyed that you keep saying things along the lines of "all you feel is constant, never ending, intense pain as you float around hopelessly, eventually spiraling into complete insanity." When you do not know that would be the case because again you are lingering on the nonsense. Not seeing the big picture. Look past your need to be overly dramatic about something that isn't as serious as you're making it. Immortality would be fun. It's space! Floating around in absolute beauty, watching dust turn into stars, watching life form on new born planets, ride asteroids into oblivion, perhaps even find other intelligent life forms.
That, to me, would be paradise… to become part of the universe once more, but I can see how your religious values would keep you from understanding how that eternity would be okay with me.