Angel would have made a dramatic and romantic Darth-Vader-esq speech at the end. Spike hated that sort of thing, but it was all written in as subtext. You can almost make a speech out of what he didn't say, but he probably would have tried to come and haunt you for it, if you tried.
I really love that about him, and about the show. They didn't sell out the integrity of his character just to produce a cheap, cheasy, sentimental moment. And if anything, that made his death-scene that much more powerful.