The "20 years" is an arbitrary figure but I have noticed that films tend to have way more cuts than they did in earlier days of film making. Sometimes there will be a conversation in the room and there is a cut for every person talking,the reaction shot and it starts to get difficult to watch.
The ultimate cuts tend to be on fight sequences. There are so many cuts that it is sometimes difficult to appreciate the fight for a fight as opposed to an exercise in how many times can the director/editor cut the scene.
Hitchcock did the ultimate 40 odd take cut scene for the shower sequence in Psycho but that was so natural it seemed like one scene. Yet movies today just seem to be one big MTV fest of cutting.
Is it simply because film is digital and it easy to do so they do it. Whereas in the "olden" days every cut meant a splice of a physical piece of film that took ages to do so the cuts where more thought through.
I like to have a scene, where there is a fixed shot, a long conversion, where the actor gets to exercise their craft in getting you involved in the story as opposed to telling the story with a cut every 5 seconds.
Why do they do it? It takes longer to make the film, and it really adds very little value. What caused this trend?