From what we're shown in the story, magic use in the corridors (as distinct from dorms, private study sessions etc.) seems primarily related to bullying. There are people using utility charms in the corridors (e.g. Harry part-Hovering an exhausted Hermione), but we don't actually see this happen very often at all, whereas bullying is apparently frequent and endemic.

Really, this makes sense. Given that there is a ban on magic in corridors, you would expect bullies to ignore it much more often than law-abiding students.

Edit: Putting it another way, suppose we live in a world in which Dumbledore is concerned about the bullying problem and wishes to use his influence as headmaster to combat it (insofar as he can do so without ending up in a confrontation with influential parents). In this world, would you predict that Dumbledore would dismiss Filch's reminder in front of the whole school?