I shall always miss my days in De La Salle University, Manila, where the chime tolls twice a day for the Angelus (noon and 6 pm), and most everyone stops and at the very least listens to the prayer. It is the threefold celebration of God's mercy and love towards man:
First, it is he who loves us first, and promises salvation for mankind. And his graciousness means he does not override our Lady's will, but permits her to respond freely.
Second, she responds for all mankind with the only response we should rightly give: fiat -- let it be done. We must respond with docility to God's will, with faith, even if we do not fully comprehend.
Finally, as God promises, his Word does not return in vain, but accomplishes as it proceeds. The Word is made flesh, and that is also his promise to all who respond to His grace.
Each time we pray the Angelus, we go back to the mystery of the Incarnation, and renew its fulfillment in ourselves -- we who are called see and love Christ in the least of our brethren, and for them to receive Christ's love through our love, which we give for His sake.