Best view ever from Mac OS X is now gone. Cover Flow has been removed with a nod towards individual image viewing in Finder. For some this may be an improvement as image attributes are now displayed in this view, for those of us who sort through thousands of photos at a time it is a nuisance. I did try to accept the changes in Finder but I found that my work flow just increased significantly. Fear not though as an enterprising company has filled that gap left by Apple.
Path Finder by CocoaTech (https://cocoatech.com/) has quite a few nice features including cover flow for viewing of images in a directory. With options like cover flow, split screen (2 directories displayed at the same time, and the traditional icon view, listing, and paned hierarchy, Path Finder is the full featured solution I wish Mac OS X Finder would be.
PSA: I am in no way affiliated with CocoaTech but I do love the product. What Finder took away Path Finder returned.