The significance of Jesus walking among the lampstands is that he always promised to be with his churches to the end of the world filling them with light, life and love.
The church should be precious and pure comparable to fine gold. Its ministers and members ought to also be as such, as their light should shine before men to encourage others to give glory to God.
It teaches me that Jesus is always with us in every thing we do. He walks among us to show us the way even in life's darkest times, and, his eye is always upon us when we stray from the path- his light lights the way to let us see that which needs to be corrected. Jesus loves his church and as much as he loves us, he is also jealous and will not be mocked. He desires a pure and faithful church, one that is victorious over sin and satan.