Smaller, engaged classes can be found EVERYWHERE. If you are a Classics major, you may have two large lectures- one an “ancient lit” class which is popular for all sorts of majors, and maybe the “Art and Architecture of the Ancient World” which is popular with engineers, history majors, all the fine arts people, etc.
But everything else will be seminars- and sometimes two professors for one small class! (A lot of the interdisciplinary stuff is taught this way).
I understand that anything on the CS/Pre-Med hit parade could be large or huge. But there are tons of things to study which even at the biggest universities ends up being small.