Jesus was not at the pool where he received sight, so the only way the healed man knew Him was by His distinctive and memorable voice. THAT voice was now right here with him. It came from a face with eyes of kindness and hope asking "Do you believe?"
Worship is intimate.
Yes, it can get loud. But even in our moments of highest praise we are to remember WHO it is we worship. That ought to put us in our proper place... at His feet... in reverence of God Most High- the One who owns the universe and all that is in it.