Best UI that still makes good use of Super button

This might be a weird question, but I'm looking for the best UI that still makes use of something similar to Unity's search function.

Here's the deal; I installed Lubuntu on a computer at work. It runs super fast, and I really like the layout and usability. What I don't like is that I can't find any programs that I normally use!

For example, today I was trying to find the volume control because someone had put it on mute. I couldn't find it in the menu, so I had to right click and add the little widget to the bottom right corner of my screen to unmute it.

So, I'm asking for a UI that will still allow me to search for programs and files in the same way that Unity does...but without using Unity.