... and it isn't because "Well, it's from 2005." It's because even though that movie cost $207 million to make, they were more interested in creating an overstuffed, sprawling King Kong epic rather than more focused, compact version that nailed every shot. The result was a largely pointless sequence which features dinosaurs that look laughable compared to the ones in 1993's Jurassic Park. You could say that Spielberg's film didn't feature anything on the scale of King Kong's massive slapstick dinosaur stampede, but that's the point. The moment Spielberg realized he couldn't shoot that scene without it looking stupid, he'd have cut it.
We know this because he famously refused to use the terrible mechanical shark in Jaws, developing an entire editing style based on avoiding it aside from a few key moments. That rule -- "If the effect looks stupid, work around it" -- has been the same since film was invented. Conversely, Jaws 3D (directed by a guy who was never allowed to direct anything else) is well-known for having one of the worst shots in history, one that would be improved if it was replaced by a three-year-old swinging a plastic bathtub toy and yelling "HERE COMES MR. SHARK!"
That movie had twice the budget of the original, by the way. Regardless of the era or the budget, effects are about what you choose to not put on the screen. Let's go back even further. In 1957's The Giant Claw, the world was ravaged by a flying ostrich puppet that had apparently been run over by a car before it was delivered to the studio:
Compare that to the stop-motion Rhedosaurus from 1953's The Beast From 20,000 Fathoms:
Warner Bros. Pictures
See the difference? If you need help, the difference is that one looks like a Muppet got rabies, and the other looks goddamn awesome. Note the way they're hiding some details in darkness in the latter one, and how the beast is standing right in the middle of a real goddamned amusement park? Both movies had low budgets, but both chose radically different methods for working around them. The Giant Claw's directors just shipped the task off to a production company in Mexico for them to handle it. The whole thing was so disorganized that the lead actors of the film didn't even see the design of the monster they were supposed to be reacting to until the movie was already in theaters.