In iOS 6, I always kept my first screen clear with just 1 icon in the dock and other apps hidden away on the 2nd screen.
In iOS7, the dock looks a little weird with just 1 icon there (as the dock is a larger than it was in iOS6!) so I am toying with the idea of having all 4 spaces filled.
The first 'Apple' folder contains all the Apple default apps and then the other apps on my dock are just the 3 which I use all the time.