Google designed Street View so you'd always be able to tell what your destination looks like before you get there. That's not all it's useful for though! Aside from virtual joyriding, here are some clever uses for Street View you may not have thought of.
Scout neighborhoods when apartment or house hunting. An up-to-date Street View tour of a neighborhood can tell you a lot about the area. Look around to see how close nearby shops or restaurants are, or how far the closest bus stop or train station is from the place you're looking at. Walk the route via Street View—you can learn whether "one block over" really means "three blocks of walking through alleys" pretty quickly.
Check for parking or transit before you go to a new restaurant or interview. Using Street View to check out your destination is one thing, but making sure you can find a garage, lot, or nearby line of meters to park your car, or where the closest train station or bus stop is located is a good idea. That way you don't waste precious time circling for parking or walking around when you could be eating, hanging out with friends, or worse, in your interview.
Search for nearby amenities near your destination. Whether you're planning on doing some sightseeing and want to make sure there's somewhere near to go to the bathroom, or you're planning a bike trip and want to know where the closest bike rack to your destination is, Street View can show you so you're not stuck when you get there.