As you walk with the Guru, you walk in the light of Existence, away from the darkness of ignorance. You leave behind all the problems of your life and move towards the peak experiences of life. Devotional worship of the Guru is one of the most touching and elevating features of our Sanatan cultural tradition.
Guruhu sakshaat Parambrahman tasmai Shrigurave namaha ||
The second line of the couplet does not literally mean that the Guru becomes Parabrahman - God, rather he is venerated as if God is manifesting through him.
Balihari Gurudevaki jinhe Govind diyo bataay.