I used to be a much bigger fan of sci-fi/fantasy. Then at some point in my adult life the cumulative understanding of plots and tropes undermined my enjoyment of any such fiction, save for parody. Now I can hardly get 5 minutes into a movie or book before I ask myself, "where have I heard this before?" It becomes all too easy to anticipate the twists and resolutions.
I've been feeling the same way in recent times.
Over the decades of reading many books and watching so many tv shows and movies, I've gradually noticed the same patterns appearing over and over again. Many books and shows/movies are not so exciting anymore, when stuff fits into familiar patterns which are easily guessable.
(These days a lot of these patterns are very much codified and cataloged on web sites like tvtropes.org).
Awhile ago I picked up a bunch of dvd sets of old tv shows I use to watch many years ago. Mostly stuff found in the bargain bins, such as 1980's shows like: The A-Team, Magnum PI, Knight Rider, MacGyver, Miami Vice, etc ... and some 1990's/2000's shows like: X-Files, Stargate SG-1, etc ... After watching episodes of these old tv shows again, I find that I don't really enjoy watching them as much now, when I can easily see what tropes are being used and how easily guessable the episode storylines are.
(Over the last few years ago I was going through a mid-life crisis of some sort, and was nostalgic for stuff from my youth. It was easy to go back and re-watch old tv shows, when so many of these dvd sets were already in the bargain bins for $15 each or less).
As for the argument that fiction somehow enlightens us to truths about ourselves... well I find that looking into non-fiction stories is a lot more revealing. Authors use all sorts of methods to create believable characters, but they fall apart when you've seen most of their archetypes.
Many character archetypes become very predictable.
For awhile I was looking for shows/movies with characters which do not always fit into predictable archetypes. Some examples are the (eventual) antagonists in movies like "Magnum Force (Dirty Harry)", "The World Is Not Enough (James Bond)", etc ... Recently I've been watching the season 1 blu-ray set of "Person of Interest" (and some first run season 2 episodes), where the writers seem to crank into overdrive this "ambiguous antagonist" trope in a similar manner (ie. the "badguy" is not always obvious).
Now after watching every season 1 episode of "Person of Interest" several times already, I find I just can't "suspend disbelief" anymore when it comes to examining such ambiguous characters. My automatic knee-jerk reaction is to guess that a guest/supporting character which we're being initially led to believe is a "goodguy", may very well end up being the eventual "badguy". (And vice versa).
It seems like I have a very hard time enjoying most fiction books and tv shows/movies, when my mind is going into overdrive and seeing what tropes are being used and guessing the possible storylines. Even watching the special effects, explosions, destruction, high speed car chases, gun fire, etc ... isn't so exciting anymore.