You have the same feature available if you use Google Photos (and then some, as you can quickly find pictures of things like dogs, cats, specific places or monuments, etc.).
Also, the face tagging option was removed from the stock Samsung Gallery but the recognition wasn't. You should be able to sort your pictures by 'face' if you go to your Gallery and select the CATEGORIES view. There you should be see a PEOPLE category. You should see some other automagically-recognized categories as well.