It wasn't clear from my post, but I actually just started my second year here. The pace is rapid, but from friends who go to other schools, it's not terribly different from their experiences. The first 10 weeks of first year, when you cover anatomy, are particularly intense; but it's manageable. As far as PBL, the cases are paced so that everyone covers a certain number of topics in a certain period of time, and that means you do have to keep at it.
I think most folks here are motivated enough to stay on top of things, but that's both due to self-selection and due to the admissions committee picking people they think will succeed in PBL. One thing that's required here is self-motivation. To help you along with that, a lot of the faculty strongly recommend students find a reliable study partner or study group so you're not on your own. Sometimes your PBL group itself can be your study pals. As a group, you pick what sections you're going to read before the next session, and often your group-mates will email if they come across something that seems especially important. That can help a lot to guide your reading.
Does that answer your question?
EDIT: Thanks, Devlyyn. I couldn't remember the numbers but it was something like LECOM-B's average was consistently 40-50 points above the national average for COMLEX.