First of all, remember, I said "average". There are exceptions among either side. Secondly, I am sorry, but looking from below it is more difficult to notice the difference than looking from above. Besides, maturity is not just submitting your assignments on time, showing up to class, and choosing not to get wasted the night before the exam with your less responsible buddies. It is very difficult to evaluate in the controlled academic environment, where professors often act like babysitters, constantly reminding of upcoming exams and deadlines. Maturity is the ability to deal with unpleasant coworkers, handle real-world environment, look at an assignment not as a student (take it at face-value, only do what's required, instead of thinking WHY the assignment is given and what answer is the person really looking to get) but as an employee. It has to do not with having a degree but simply with being older and more experienced. Of course, if the person with the bachelor's have had a coddled life in college, did not work, etc. - they hold no such advantage, but those who had these extra two years of work, and many upperclassmen worked in corporate environment or research labs, etc. rather than freshmen who worked at MacDonald's and Sears. It's merely the experience that counts, not the piece of paper diplomas really are.
Have I ever said that college credit is the only way to gain experience? I have never believed that, and my own travels have provided me with more insight than any class ever has. However, for the purposes of preparation for pharmacy school, someone who had to write the senior thesis or handle four 400-level classes is generally better prepared for pharmacy school. I remember electives while I was in pharmacy school, and all those 200-level classes seemed ridiculously easy, compared to what we had in pharmacy school (now, when I was in undergrad myself, I did not find them that laughable). By the way, many of the best students in my pharmacy school class, including myself, did not hold a bachelor's degree, which is why I oppose making a four-year degree a prerequisite. I knew very well that pharmacy is what I want to pursue, so I did not see a point in spending another two years studying something else. However, by then I have travelled halway around the world, spoke three languages and was a 4.0 student while taking 20 credit hours a semester on average, not just prerequisites but also classes in business, history, international relations, etc. There were a few other people like myself in my class, but majority did have a bachelor's degree - and we all were at an approximately the same level. It is the reason interviews are required - so the admissions committee can evaluate the student firsthand. A piece of paper is afterall just a piece of paper.