I am a new Ubuntu 14.04 user (having moved from Windows XP at the advice of a friend), and I'm loving it! I like Unity a lot, but one thing that I dearly miss is the Windows Start Menu's folder-like structure to categorize applications in folders (e.g. Games, Internet, Graphics, etc.). I found and installed XFCE, and I installed the Whisker launcher, and I really like that a lot because they had a similar folder/menu structure of the Windows Start Menu, but Unity works very well on my machine and has obvious advantages over XFCE / Whisker. I'm wondering, is there some kind of application that I can use in Unity to simulate the Start Menu like functionality of XFCE/Whisker? For example, is there an application which I can dock in Launcher that LOOKS like the XFCE/Whisher launcher? The closest thing I could find in Unity was opening Ubuntu Software Center > Installed, and I see them all categorized exactly how I want them, but I can't launch the apps from there.
Here's a mock up of what I'd like to do in Unity: