Are you using Windows 8 rather than Windows 8.1? Unlike in Windows 8, in Windows 8.1 you don't get anything added to the start screen when you install a program. It's up to you to manually choose which ones to pin to the start screen (you choose from the all apps screen) so you don't end up with things like installers and helper apps spewed over the start screen.
Anyway, I've got about 85 programs manually pinned to my start screen. I've got them organised into about 13 groups such as 'Office & Notes', 'Scientific & Numerical', 'Graphics', 'Audio', 'Video', 'File Utilities', 'Disk Utilities', etc. I find this really useful because I've got many programs I seldom use but do a key task. A quick scroll through my start screen quickly reminds me what programs I have to do a particular task.
I actually also use a desktop start menu (Start8) so that I can quickly launch any app without switching away from the desktop, but I do really appreciate the quick overview of my main apps that my personally curated start screen provides.