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Well, lemme tell you-- when you get 8 years of marriage under your belt like I got; you won't be askin' that no more! ;-)
You're not catching it-- and who can blame you out of context -- but the line is supposed to harken back to the scene where Padme confesses her love to Anakin -- "I'm not afraid to die..." she says and then kisses him.
Here, he echoes it-- in effect saying "I take you to be my soul mate by saying the same things you say" -- but then he puts an Episode III twist on it.
It's just an idea. If we can get the right line at this point, it really brings the movie home in a way that it won't with just the wedding. I mean, the wedding's pretty and all -- but it's so generic that it could have been cut completely if we just cut to Artoo and Threepio talking in a corridor somewhere -- "What's that Artoo? A wedding? Between Padme and Master Anni? What's wrong with you, you know Jedi are forbidden to marry!" There is much left to say at the end of this movie and it's all kind of left in a mess and swept under the carpet by this pretty, but unspectacular wedding. I think one good line from Anakin would crystalize the ending-- make it feel like we've come to the end of this episode.