Bing still has this feature, though they've updated it (made it less discoverable, I feel) and removed older photos. If you go to https://www.bing.com/maps and point at the "Road" menu on the upper right, you will see "We have updated Bird's Eye. Learn more", which gives you the following information:
>Bird's Eye has changed
> New and crisp Bird's Eye imagery is available in many metropolitan areas. There are two ways of viewing the new Bird's Eye.
>1. In cards
>2. Right-click on the map
>Note: Bird's Eye may not be available in your area as outdated imagery is no longer available.
If I go to central San Francisco or Seattle, I can right-click the map as indicated and select "View bird's eye", and the picture will show up.