Think about all of the things he has seen, all of the worlds he has explored, all of the green women he has slept with, and when he is faced with death, it shocks even him, to the extent that all he can say is, “Oh, my.” I’m not sure how popular this scene is among the Star Trek Zeitgeist, but I imagine it’s probably hated. I, however, love it. Feel free to tell me how I’m wrong in the comments.
You don’t think there’s eloquence in a man overwhelmed by seeing the beauty of the journey into afterlife enough that he uses his last breath to express loving wonder?
I think you’re missing the point of the man if you think he should give a speech as he exits stage left - you turn him into a melodramatic buffoon, like the caricature over actor who takes minutes to die delivering a soliloquy in death.
As I said below, I think there is a happy medium between a speech and just two words.