Normally there are other life and psychological or even health issues behind or introduced by being a workaholic. Especially when a person is aware of such issue but cannot find a way to reset life pattern and find the balance - that is when help is really needed for sure. Also, for certain groups of people without much healthy social distractions, it is not that easy to get work out of one's mind without external stimuli or help.
Workaholics don't actually have an illness. Workaholism isn't really a disease. The idea of treating productivity as an illness is absolutely ridiculous. I think that if more of us emulated workaholics then the world would likely be a better place. But as they say "All work and no play makes Jack a dull boy."
As a society I think we need to stop labeling people and accusing them of having something wrong all the time. Workaholics are not harming themselves or anyone else by being productive. While they may spend massive amounts of time working they are also likely to take breaks just as anyone else does. They shouldn't have to attend some group meeting because someone else finds their way of life flawed.
Workaholics suffer from other mental issues, like OCD, or use work as a diversion to avoid family strife. Working too much may cause emotional harm to an individual or family, but so can watching too many sad movies, or any other habit-forming bahaviors. It is not however, physically dangerous, and so should not be a mandate for group therapy.
I do not think that workaholics should be advised to attend group meetings just like alchoholics do. I think that there isn't really a reason for them to do so. I think that if working is their addiction, then it isn't really a problem. The problem itself is something that need to be dealt with by their own families.