Not that much, as the peak of the dinosaurs coincided with the breakup of the landmasses...
No the peak of the dinosaurs only coincided with the begining of the breakup, there was a sharp decline thereafter. IIRC the peak you mention was during the Jurassic. There was much more tectonic activity during the Cretaceous (or at least more drastic activity!!) than there ever was in the Jurassic. During the Jurassic there wasn't an overall massive change, save for maybe the formation of a couple of waterways ect, whereas the Cretaceous saw the actual formation of the continents we are familiar with today (only not quite yet in the correct place).