Until you spend some time on the lonely side of the podium, it's hard to comment with a full scope of knowledge on this question.
Classes where laptops are left closed result in much more engaged and dynamic classes. Those where they are open result in the "room full of zombies" effect. There's a reason it's so annoying to talk with somebody who looks away and digs in a purse or engages elsewhere when it's your turn to speak. The bio-feedback loop collapses and the teacher might as well post lectures on YouTube and students post questions in an on-line forum somewhere. Heck; on YouTube you can pause and re-play stuff. And it's cheaper!
Universities were built and people attend them at great cost in order to assemble like-minds in one place so that everybody can benefit from those aspects of humanity which thrive on face to face communication, (also earned at great cost through the trials of evolution). There are many layers of communication taking place, both subtle and extreme, which bring a room alive when people engage in each other in meat-space, but which are stripped away when it's done through a computer screen. This doesn't mean that the virtual world is without benefit. It's not; computers are a boon. But the virtual world can be attended any time, any place you can flip open a laptop. It was built to simulate the grand effect of a campus assembly. But if you are actually attending a college assembly. . ?
Laptops need to be used responsibly. Turn off animations and distracting screen savers in respect of the people sitting near you. If you're going to take notes, then sure, do so, but have the courtesy to limit it to notes and stay engaged in discussions. If you need to look something up to aid the discussion, then sure, do that, but in general things work best when all eyes and ears are on whoever is speaking. If you want to play on Facebook or dip into a game, then that's fine by me, but please physically leave class first because you're literally sucking the life out of the room by removing your mind and leaving a vacant corpse in your chair. It's creepy.
Ideally, I like to have wifi and fluorescent lights killed and windows open for fresh air. I also like to rearrange the chairs so that we can all see each other to better engage. Do that, and everybody wakes up, but these days it's very hard to scrub an environment of all the fuzz designed to keep us zoned out.
-FL