There is such a site and it's called Geograph... and it's wonderful. Crowd-sourced photos rather than 360° panoramas, but that's all you need. (It's UK and Ireland only, sadly.)
I worked with the lovely Geograph people to integrate it into my routeplanner at cycle.travel. It works like this:
1. Go to cycle.travel/map
2. Plan route (by typing places or clicking on map)
3. Drag route if it doesn't go the way you want
4. Click on section of route to see pictures
Example (picture tells a thousand words, and all that):
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Thanks - that's nice
Although I'm wasting my lunchtime playing with it!