<p>I suggest you look at Pitt using Google Satellite map setting - zoom in close enough and the buildings are listed. You will get a better perspective on the size of the campus.
The number of students has no bearing on how crowded classes are. A larger university will have more professors, more class sections and more libraries/study areas.</p>
<p>The only way to really get a sense of the campus is to visit. Almost all of the buildings are contiguous. It’s a fairly dense campus - you can get from one end to the other in 10 minutes. It feels urban because there are some major streets running through campus, but everything is close by. There are green areas too. It’s the best of both worlds.</p>