Google Street View is currently available when creating segments and for visualization at the start and end of segments. When you visit a segment page on the Strava website, you can view the Google Street View at that location. This can help you determine the exact start and end of the segment when you are out riding or running. Click either endpoint of the segment on the map or select one of the options from the map menu to view the Google Street View.
Read more about Strava's switch off Google Maps.