There are secret items hidden in the Go menu that you can easily enable. Some things are put there by the system and some (like Google Apps) are installed by programs like Chrome. Here is how you enable them.
- Right-click on the Go menu and select Edit Applications…
- Select the item you want to make visible.
- Uncheck Hidden Item
- Check Only Show in KDE
- Do this for all the items you want to enable and click Save