Yes. To be honest, I have a hard time getting my head around the notion of banning them - partly because I game exclusively with adults, which inherently changes the notion of "DM's authority". So the DM gets to rule on anything
within the game, but the moment it crosses out of the game, that's another question.
However, the flip side to that is that people are expected to police themselves, and we'd have no problem ejecting someone who was constantly distracted other otherwise troublesome. The convention goes both ways.
As it happens, very few of us use technology at our games, although it's becoming increasingly common. In particular, my most recent 3e campaign (two years ago) saw people referencing the SRD and dndtools on their smartphones frequently, which struck me as a really good use for tech. And 4e games have been similar with DDI.
The one reasonably recent case where I did find the tech oppressive, though, was at a 4e game where three people (the DM and two players) each brought along laptops for use with DDI. With the DM this was fine, as DMs commonly use screens anyway for various reasons. But I found that with the other players it was much more of an issue - the screens served as barriers that had a surprisingly strong effect on breaking up communication. I did not like that session (fortunately, it was never repeated).
But that one was before tablets became as common as they are. I genuinely believe that they're a game-changer in the use of tech as tables, and also mark the point that a game
almost has to have electronic versions of the books available in some form.