I'm usually at my desk at home or the office, or in bed, or some other place with a real computer, or doing something I actually want to be doing, or driving. In none of those situations do I want my phone.

In the remaining cases of "waiting for something but not equipped with a full sized computer", I'm quite happy to use the phone.

The greater problem is "spending time doing less-productive stuff on the Internet" -- I just prefer doing so with a real computer.