Workaholism is more than a dedication to your job. It's a near-obsessive commitment that supersedes most, if not all, other aspects of life. For many, workaholism is a true addiction, inextricably tied to feelings of self worth and identity.
The problem with work addiction is that many applaud the addict instead of asking if he or she needs help. This applause is the greatest high in the world and makes the addict work harder. This can be deadly.
I gave myself an "A" for having gotten really good at working really hard. And then took the weekend off. Do you want to know the coolest thing? My work was still patiently waiting for me this morning when I came back to it!