I have counted myself as "lucky" a few times when something disastrous could very easily have happened, and I tend to think that "someone" was looking out for me on those occasions.
Of course, we might say that God himself intervened or had some purpose in life for me that kept me from the disaster, but there's every reason to think that his angels do very genuinely work in our world. The Bible has a number of examples of such a thing, so there's little reason to doubt it even if I didn't see angels in the way that a movie might portray it.