You really should be communicating with your profs during class, not dinking around on your laptop. Unless you type quite a bit faster than most hunt and peckers, you're going to take better notes with pen and paper anyway, and there are relatively few situations where you really need a computer during class as a tool.
What really should be banned is the use of PowerPoint lectures. You know the ones..... where your prof essentially scanned all the relevant sections of the textbook and then cruises through 200 screens of unreadable shrunken slides at light speed while staring at his laptop. Most folks use it as a crutch rather than a visual aid to get a handful of important points across visually, or provide a persistent framework for discussion. It's irritating. I'd much rather see the chalk board in use, screeching and all... at least then the instructor is forced to cover the material at the speed it takes him/her to think through it, giving you enough time to grok it during the lecture.