As a photographer doing street art shows, I have heard that line many times from the public. It is often said in relation to images depicting a sunrise or a sunset. Most everyone has indeed photographed at these times of day, and they may believe that theirs is 'just like' the one I am exhibiting. I always smile when I hear that.
There was the sunrise over the Grand Canyon where I am laying down on a ledge over a precipice to catch the shot; there was the morning I got up and walked through the marsh hoping no gators or moccasins were around to get the sunrise; there was the one day in a week of waiting where the sun/clouds/sky and weather all combined to make a magical sunset, etc. Yeah, I guess they do have one 'just like that'. :-)