It's fascinating how it's one specific movie whose 10-year anniversary really marks a turning point. Back in the mid-to-late 00s, movies like The Departed, NCFOM, There Will Be Blood, WALL-E were all significant to my development as a film maniac, but when they turned 10 I barely noticed and didn't reflect at all. But with TDK, the passage of time just hits you like a tidal wave.
Even weirder (despite it actually making sense): TDK is older now than The Matrix was when TDK came out. But because I came to The Matrix years after it was released, in something like 2004-05, it just always had a place in my mind as an older movie from before my time. No matter how much older, 5 years or 20 years, it all feels roughly the same. Entirely different when something actually becomes a phenomenon and then ages right before your eyes.