That is the primary method of using it, it's not the alternative.
The problem that Unity allows less than ten apps on the side
For one you don't need to know the name of the program, you just need to know a few keywords about what it does. e.g. type in "brow..." in the dash and see it proposing Firefox and other browsers you may have installed. In case you still have no idea what your program does, nor what its name is, you can still navigate to find your programs the old fashion way, using the dash and filters. I would assume that after using a program once or twice a user can either drag its icon to the side or simply remember its name. And if they do neither of those, the dash keeps a history of most frequently accessed programs. While using Unity I had 3 icons on the launcher and I _never_ even used them, and I run many apps at once.
Not being able to use the programs installed on my computer?
This is the first I've heard of Unity conflicting with a program and that might be a bug in one or the other.
But if you're really using seriously, why pontificate about it.
Since many are pontificating against it, I think people deserve to be exposed to counter arguments. A lot of people have taken upon themselves to decide that Unity is this and that, without even using it properly. They spread fud as truth, instead of disclaiming it as their own opinion. And frankly when you see the arguments, it is obvious that they haven't used the thing for more than a few minutes. It just strikes me as odd that people would keep doing this when there is ample evidence that the GUI is positively received by most people who give it a chance. If you don't believe me, ask System76 or Zareason, after all their business is directly tied to having people satisfied after they buy a linux box.