I think it depends a lot on where you went to college, what kind of courses you took, and how good at studying you were then vs now. I can't speak for clinical years (I assume those will be harder) but as for classroom years, so far I think vet school is much easier than college was. I went to a hardcore science/engineering school, where everyone had to take exactly the same core classes for the first 3-4 semesters, and I was TOTALLY unprepared for the level of rigor coming out of high school. There were so many things most of my classmates knew like the back of their hand that I'd never even HEARD of before. And there was barely enough time to try to learn the new material, let alone try to go back and catch up on all the stuff I'd missed because my high school classes weren't very tough. I was flailing around literally trying not to fail out of school, doing nothing but go to class, study, and sleep, for the first two years. I'm incredibly glad I went there and wouldn't change it for the world, but it was a trial by fire.
In comparison, vet school is a lot of work volume-wise, but it's not conceptually that difficult. There's just a lot of it, and a lot of it's memorization. I also figured out (somehow, magically) between college and vet school HOW to study effectively (and the fact that the courses aren't things like complex variables and theoretical mechanics helps a lot. 🙂) I think all the material so far is stuff that a reasonably intelligent person can definitely grasp and remember; and it's taught at a level where you don't need more than a basic biology/chemistry background to understand it. Whereas in college I felt like I either needed to be a mathematical genius or go back and redo my last two years of high school to have a chance of understanding anything. Now, I go to class and study a lot, but I also have time to do research, run, play with my dogs, cook, hang out with my family, hang out with my friends, and still get good grades. So for me, vet school so far is a lot easier than college.
My experience is probably not typical, but I'll toss my dissenting opinion in there anyway. 🙂