Definitely true. There aren't many places in the world today that could support the larger herbivores, much less the larger carnivores.

Unless we're talking an alternate history type of deal. I expect we'd see a bit more unity among human society and a generally lower level of scientific knowledge and technology; we'd most likely have remained nomadic hunter gatherers for a much longer period given the dangers of remaining in one place, between territorial species and those who, inevitably, would have adapted a taste for humans over the years. Beyond just agriculture, tribes would have needed to develop some pretty heavy weaponry before they could reliably settle in one place, and that constant foe would shape the direction that science and technology took, until we reached a point where dinosaurs were a negligible threat. That process took long enough without the dinosaurs! I imagine the words for various dinosaurs would also be quite different, maybe one or two syllables long each. And I expect we'd be very different ourselves, given that we've had relatively little selective pressure on our gene pool compared to most other species for most of history- in this scenario, dinosaurs would have provided selective pressure against the earliest directly traceable ancestors of man, which simply was not present for them at all in this timeline.

Pffft. Speak for yourself. :)