That's not really the same as running iOS applications as Mac applications, which is what the OP wanted. The iOS simulator is designed for testing iOS apps on a Mac – yes, you're running them, but not in the same way that a typical user would. Also it's impractical for everyone to register as an OS X developer.
As for the Mac being "intuitive," it is – but if you're used to a different system, you will naturally have to adapt before understanding the intuitiveness. As you begin to understand the mentality behind Apple's design and OS philosophies, things will make a lot more sense to you, I promise. It's much like the mental shift you had to make when you learned to drive a car, when up to that point all you had been used to was riding a bike.
It may someday be possible for users of a Mac to access iOS apps in a seamless virtual environment – but for the time being, Apple prefers to keep the two systems separate.