Being a current law student, currently in a class of 50 people, two-thirds of which are using notebooks in class, I feel that computer usage in classes is adventageous to those who make it as such.
My keyboard is so quiet, it wouldn't distract anyone. Nobody I know looks at porn during class. Some people play games and browse the internet. Some people browse the internet for purposes relevant to the class. I've bailed my prof. out of difficult questions many times by having an internet connection and a quick search at hand.
Law students are no worse than anyone else. In fact, some of the best community minded citizens I've ever met have been practicing attorneys and other students in my school. Granted, I go to a school which encourages a more cooperative learning environment (it's a 2nd tier school, so it doesn't quite have the competitive nature of the top 10).
Most importantly - I use a notebook, because I never learned to use hand writing as a primary form of recording data. I'm slow writing by hand, I don't know cursive at all any more and I type 2-3 times faster than most people could ever write. When a professor has forced us to use hand writing on a exam (the only time I've had to hand write anything for a good 10 years, other than minor notes or margin notes in my texts), it's been a huge disadvantage to me.
If I had to take the bar exam (which, among other requirements, requires 6, 1 hour essays) by hand, I would do significantly worse because of the types of stresses and physical challenge accompanying doing that much hand writing. You can argue all you want that I'm weak or pansy or whatever.
The truth is - I don't use handwriting in my life. I have no need for it. And it generally only makes my life easier. Even in my mind, writing by hand is a vestige - many elementary schools no longer teach cursive writing.
Computers are a natural companion to learning. The internet is even more so. It's okay for a single prof to do it, but understand it comes at a cost - some students are going to learn less and perform worse in the class. It's no longer some fringe technology - I'm sure the amount of typed data far exceeds the total amount of hand written data today. It's part of our world.