I used to always start a terminal by clicking on a Konsole icon on my taskbar...

...until I discovered Yakuake!

In BT4, if you go to KDE Menu -> System -> Yakuake

This will start the Yakuake terminal in the background.

From now on, any time you need a terminal, hit F12. To make it go away, hit F12 again.

To make it look nicer:
Right-click the body of the Yakuake terminal, go to Settings -> Use Konsole's Settings. The right-click again, go to Settings -> Save as Default.

I know it might seem a little excessive to start a thread about this... but I really think everybody has to give it a try, I think it's fantastic!