Maybe US IKEA is different from European ones, but there are literally arrows on the floor that guide you through the whole thing? Follow the arrows and you're out.
The whole point is that the thing is set up like a very long serpentine track so that you 'see everything' rather than that you can go to the one thing you want and then to the cash register. This is because they - rightly - figure that if they can keep you in the store longer and expose you to more stuff you might buy more.
I did not claim they guide you to the exit. What I said is that you don't get lost if you stay on the path. A scenic route to the exit is still a route to the exit.
Also: if you want to get to an actual exit it is mandatory (at least over here) to have clearly visible, emergency exit signs so people can get out in case of fire.