I use it all the time in civil engineering. There's always some question I have for which we didn't collect data or photos about and before I send someone out to look, I check streetview.

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.