UVa is the perfect size. We're not so big that it's hard to see your professor or make friends, but we not so small that there's nothing to do.
If you present yourself to your professors, they're happy to get to know you. Most of my professors know me by name.
Class participation varies by class. I know during my first-year, a lot of people didn't show up for chemistry, physics, or math because they had already learned the stuff in high school but didn't take the AP exam or didn't score high enough on the exam. Generally, attendence to class is around 95{4a082faed443b016e84c6ea63012b481c58f64867aa2dc62fff66e22ad7dff6c}, but that might vary depending whether the professor posts the slides online or will only give notes in class.
UVa students can have fun, but we do study quite a bit, too. I would say engineering, science, nursing, and commerce majors all study the hardest, followed by the other majors. Engineers tease the College by calling them the "College of Arts and Crafts" because they usually have less homework than us.
I really enjoy my major's department. A lot of the professors there have graduated from some of the top universities in the country, and they're always happy to see you on a personal basis. Engineering majors are usually pretty small, so everyone knows you by first name. Computer engineering is really interesting, but also really challenging, but if you love what you're studying enough, that should be enough to get you through it.
I spend a lot of time with professors outside of class. Some professors have gone to lunch with me, I've been apple picking with one once, and I went to another's house for a final exam review. They're always happy to help students learn. Most professors in the engineering school at UVa aren't there just for research, like other universities.
UVa's academic requirements, especially in engineering, are very difficult. If you show the effort in class, though, most professors will work with you to help you understand the material presented.
In the engineering school, learning is definitely centered around getting a job. Companies notice this, too, because in the fall, almost 200 companies visit us for our three-day career fair, ranging anywhere from Intel to Google to Microsoft to Northrup Grumman to Rolls-Royce. Companies know that UVa graduates are really dynamic and smart, so they're happy to get their hands on a UVa student early on for an internship.