Hear, O Lord, when I cry aloud;
have mercy on me, answer me.
In your behalf my heart says:
"Seek my face!"
O Lord, I seek your face."
In Judaism some prayers, such as the Shema, should always be uttered aloud, and other prayer is silent, internal, like the silent Amidah in services. It is not for G-d's ears that prayer is aloud, but our own -- it focuses our own attention on our words, our plea, on our reaching out to touch the source of power, the divine.
One of the traditions of Judaism is that in the beginning G-d created the universe as a material container into which divine light and spirit were poured; but the material container could not contain the G-d's infinite divinity, and ruptured in a great cataclysm, creating the dispersed universe of space and matter that we know. But G-d's light and divinity clung to the shattered shards of the universe. Every molecule, every bit of matter in the Universe (including living beings) carry within the spark of divinity.
Our prayer goes out through that spark of the divine within us, and the answer comes back to us from that spark within. Notice how the Psalm says "In your behalf my heart says..." G-d speaks to us through our own heart, and through the hearts of others that carry that divine spark.
I think that there is no question that G-d hears us and has answers for us. What is questionable is whether or not we can hear that response that vibrates in all of nature, in all the people around us, and in ourselves. We seek G-d's face, yet it is all around us, just waiting to be recognized. Prayer is an opportunity to draw upon the power of the divine that will help us see and recognize G-d's face in all it's manifestations.