Chassidim say of the Baal Shem Tov that he would travel around the little towns and villages of Eastern Europe, asking Jews how they were. However poor or troubled they were, invariably they would reply, Baruch H'shem. It was an instinctive expression of faith, and every Jew knew it. They might have lacked the learning of the great Talmudic scholar, or the wealth of the successful, but they believed they had much to thank H'shem for, and they did so. When asked what he was doing and why, the Baal Shem Tov would reply by quoting the verse: “You are holy, enthroned on the praises of Israel” (Psalm 22:4). So every time a Jew says Baruch Hashem, they are helping to make a throne for the Shechinah, the Divine Presence.
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The Gemara says that one should always say praise to the Master fist. This refers to the first three berachos of Shemoneh Esrei where we say praises to H'shem declaring Him our head. It is for this reason that these blessings are called the three heads" When we make H'shem our Master then He does good with us.
MiPeninei Noam Elimelech