This is not really a fair question, or perhaps, not a well framed question.
Rhetorically, one can pose a question, "Is it possible for an amateur to take an excellent photograph with a point and shoot camera?"
The answer is, obviously, yes. Given that certain factors come tothether, such as luck, some, instinctive talent and such, it can, and, often does happen.
The term, "snapshot," then loses meaning, no matter who is taking the photograph. Not every experienced photographer uses the exact same processes that you do, but experience teaches your brain, hands and whatever else you carry within you, what makes a good shot. If you hadn't moved those tourists over a bit, it might still have been a "good shot." You would, probably framed them well and held off tripping the shutter untill the moment was "right." Including the Golden Gate Bridge made the picture that much better, but an amateur may have made the exact same decision.
There was a time, when I considered myself a talented hobbyist, I could walk around an outdoor setting, camera in hand, looking for good shots. When walking from shade, to full sunlight, cloud passing by, etc. My hand, already on the apreture ring, would automatically click up and down the f-stops, usually without any conscious thought. When the time came to shot, such as some wildlife, a race car, etc All I did was pull the camera up to my eye, do a quick focus and ... shoot. Didn't always have time to set up, or bracket my exposures. Sure, not every frame was excellent or, even usable, but I got a lot of images I might have otherwise missed if I hadn't developed the instincts I had. These shots are what the literal dictionary meaning of "snapshots" are. But they were, also, among my most successful photographs.
So, again, it's not whether or not an experienced photographer can ever take "snapshots." The statement CAN be, fairly, made that he/she can CONSISTANTLY get better shots than one who is not.
Kind of like professional level sports. In pro football, "on any given Sunday," any team can beat any other. But, are my Forty-Niners going to the Superbowl this year?
Doubt it.