The Five Star Stories has dinosaurs on a few of the planets, which are inexplicably identical to various species that once roamed the Earth. The level of dinosaurs a planet has is actually a pretty good way to measure its age. The young planet Juno has quite a few, although they're now threatened by humans and other introduced mammal species; the older Delta Belune also has dinosaurs, but they're small and birdlike; Kallamity, supposedly the oldest inhabitable planet, doesn't seem to have any dinos at all.
In Steel Ball Run, Diego Brando becomes a Wereraptor after he gains a stand ability.
Dinosaur King isn't a strict example as it's focused completely on dinosaurs, not just throwing them in for Rule of Cool. But consider this: In Japan it was preceded by an insect-battling game called Mushi King. Then the designers sat down to plan a spinoff and asked themselves "What's better than insects?" before concluding that Everything's Better with Dinosaurs.
Getter Robo. Just... Getter Robo. If there's room for a dinosaur at any given time, then they will be there. And it will be awesome.
Dinosaur mecha piloted by dinosaurs. YEAAAAAH
The School Festival arc in Mahou Sensei Negima! has the engineering club construct a robotic T. rex because it would make the festival parades that much more awesome. This fooled The Hero at first since it was so life-like. They occasionally go berserk (though no one is ever hurt), giving the author the opportunity to have the lead heroine slice off its head with her BFSsince it was a robot.