My time spent practicing graphic design is definitely less than any of the other disciplines I've worked in, however I've been working with Adobe Illustrator more often recently.  Illustrator and I have had a long running love hate relationship, and I've mostly avoided it.  When I was working at FlightSafety International as a Graphic Design Intern, I started to learn more how to use it.  Though my projects were simple, it helped me learn a good foundation of skills.