Yes, a full day photography course will certainly improve your skills and photographs, but sometimes just don't have a full day to spare.
Or, if you've done a Course, but don't put your new skills into practise, and make them a habit, there won't be a natural workflow. You will miss photo opportunities, or just resort to using 'AUTO' and taking average photos.
Workshops are an ideal way to reinforce what you've learnt during a Photography Course, and improve your expertise in an area of Photography that you find interesting and enjoyable.
The Workshops run for approximately 2 hours. They are designed to help you further your photography knowledge and experience relating to a specific subject.