Occasionally glancing at a wristwatch is far different from people that are totally absorbed and engrossed in their cell phones, tablets or laptops. People drive their cars while texting and as a result they are not paying full time and attention to their driving. Pedestrians in a crowded area have a duty (if only out of courtesy) to watch where they are going.
I have seen numerous times at Disney and elsewhere when cell phone users have bumped into other pedestrians. I have seen fights result from this behavior.
Most people just don't multitask very well. If you want to text on your phone, get off to the side and away from other people. I think Disney is restricting this to the tent areas to avoid traffic problems. :wave: