I taught mine to find cash machines. That was handy. I just had to say "find the money" and he would walk me to a machine. I was living in a Los Angeles at the time. Unfortunately he never found any hidden pirate treasure.
The dogs get used to routines. For instance my dog would begin to do the next change in direction right as we would hit the curb on our 5 day a week walk to work in the morning. That was handy until I wanted to go the other way to the grocery store.
For every positive I can tell you a negative. I have had two dogs and switched back to a cane. My life changed and the cane is better for now.

Mine will take me hom, depending on where we are. If we’re on a regular route I can tell her “Let’s go home.” She’ll lead me there.

​

EDIT (Add-on): Most popular media gets guide dogs wrong. You never just silently follow your dog. Your pace varies greatly based on your terrain,and environment. The leash/harness runs both ways. You need to direct the dog with verbal commands. The dog will tell you when/where to stear around obstacles. Therefore, you need to know where you are going and how you want to get there. How many intersections? Turn right, or left? Is there a table/chairs/etc. you need to avoid? The dog will guide you to locations it knows you want to go to if you’ve trained it to go there. Clicker-treat training works well for this. There must be incentive for the dog though.

They can remember common libertine with training, and other than that, they kind of just guide you around obstacles etc