Classic GNOME menu

Install Classicmenu indicator

The ClassicMenu Indicator is a third-party appindicator that brings the classic Gnome menu back. To install:

sudo add-apt-repository ppa:diesch/testing
sudo apt-get update
sudo apt-get install classicmenu-indicator

Run ClassicMenu indicator from Dash. You should be able to access your applications from the system tray now.

An Alternative method: use quick launcher app like Gnome Do or Synapse

Quick Launcher apps like Gnome Do or Synapse allows you to open your application very quickly. You just have to press a hotkey (Ctrl + Space) to activate the search box and you can quickly search for the app you want.