There are several other advantages in using the pole which have not been mentioned.
Firstly, it is an absolutely superb tool for mapping the contours of your swim with a plummet. It's amazing how many small but significant fish holding features can be found in barren swims.
When these features are found you can introduce your feed with pinpoint accuracy by using a cupping system.
Poles are usually sold with several spare top kits. This makes it possible to use two or three different set-ups in the same spot to cover all eventualities.This is a lot quicker than setting up two or three rods, and probably cheaper.
Until I started using the pole I did not realise how many fish feed off the bottom. During the summer, I now catch far more quality fish up in the water than I do by fishing on the deck. I know that you can use the waggler for this method but I find it far more productive on the pole.
As others have stated, the pole should only be used when and where appropriate. It can be an addictive method resulting in anglers suffering from 'poleitis'.