"All it does is encourage people to multi-task more. And that is not a good thing. Our brain isn't good at multi-tasking (in terms of focusing on different things), we end up doing each job half-assed."
While I agree that it is a bad thing to do too many things at once, in our environment, it's extremely hard not to do so. Especially for someone like a college student, as I am, I mean, I normally end up having to work on calculus, physics, and programming (Not to mention my other classes) all at once. Learning to multi-task is *extremely* helpful to do this. Simple things like in-game browsers that make us better at doing two things at once without getting them confused actually does help in the long run. Think about a pilot, for example. They have to learn how to read their HUD, maneuver, check all of their system status(es), as well as remember how many times to blink to change screens on their helmet, along with whatever else they have to do. Multi-Tasking isn't always a bad thing.