However, there is another reason the UI of the Galaxy S5 looks so clean and simple.
The Galaxy S5 has 40 applications only, which is much reduced compared to, for example, the Galaxy Note 3 having 51 apps. 40 applications in the 2 pages. That's it. If wanted, other relatively less frequently used apps can be easily downloaded through Galaxy Essential and Galaxy Gift widget.
Yes, removing 11 apps sure helps make the UI look "clean and simple".