Filmmakers can probably get away with light grey text on a black window much easier now, because it's now so far from most filmgoers' everyday experience of computing. Whereas in the time of Jurassic Park, the DOS command line was not at all exotic.
Or... Film is a visual medium, and so things have to look gee-wizy, because light grey text on a little black window looks incredibly boring. Have you you not seen a movie featuring computers in the last 35 years? https://www.youtube.com/watch?v=pe6gGUR3Ga4