Example - random sheriff's office calls in a phone line ripped down when I've got one foot out the door for the day. I pulled up the address on Streetview while she was explaining the scene to me, and it sure looked like coax on that side of the street, our lines were on the other side. Sure enough, 45 minute drive later I called the sheriff and told them to call the cable company.
When you cover an area hundreds of square miles you can't go look at every job before sending a crew out. Pull it up on Streetview, even if the images are 10 years old it's probably still the same.
I also use it to preview a route when navigating from one place to another in unfamiliar locations. That way, I typically don't need any further instructions, the guidance ends up being review anyway and i don't need to worry soich about poorly timed or ambiguous instructions.