The hairs stand up on my neck when i hear the expression "photo op" as in "you should go to Burning Man; good photo ops there." The term isn't meant to be pejorative: there are always legitimately cool environments and events that are hard not to point a camera at—full of interesting things to look at. I certainly love any foggy day in San Francisco, where light is diffuse and sexy, and objects fade off magically into distances... i guess, for me any overcast day is a photo op.
Of course, those obvious photo ops—whether sunsets or Burning Man—are going to have lots of cameras trained on them, which means it's that much harder to find your unique view of this thing. There is thinking that the best photos couldn't have been taken by another person even a moment before or after: they're unique combinations of time and place. So personally i try to avoid taking my camera out when everyone is taking pictures.
But there's this other negative side. As if photography is about the subject matter and not the photographer. There's a line in Susan Sontag's classic "On Photography" where she points out the distinction between a beautiful photograph and a photograph of a beautiful thing. Artist after artist repeat this notion in their own words. Bernice Abbott described it as "learning to see" and Elliott Erwitt said "...i've found it has little to do with the things you see and everything to do with the way you see them."
You don't need any particular subject to explore how to see it, how it looks around the prevailing light, how it moves in a visual space. You can do this in your bedroom. You can do this in your town. While it's fun to go to Burning Man, you don't need wedding or spectacle to take some photos. The idea of a "photo op" puts the ownership in the wrong place, and i guess that's why it irks me.
When people ask themselves the question: what makes a great photo," i'd suggest it's only partly about the the external thing, it's BETTER when it's has something of you in it, your relationship with this thing you're looking at, and not just seeing. The best photos have both: you and the subject. So don't blame (or rely) on beautiful subjects to make your best images—any odd thing might be the subject of your best work.