In fact, few words might be as important as those you hear in the proposal. Call me overly symbolic, but I believe a proposal sets an important tone for a couple. Yes, divorce rates are falling (but marriage might not be as popular as it once was), but the language of committing to another person is still paramount. And what better way to be deliberate about your words than by quoting a poem?
So rather than worrying about orchestrating "the best marriage proposal ever," choose your words... and carefully. After all, marriage is built on communication. A nuanced, thoughtful, and romantic poem in your proposal just may be prelude to a blissful happily ever after.