Gary,
My father-in-law is currently fighting the disease. He has had it for about 5 years now and I have witnessed its progression, especially over the past 3 years. He has been to several doctors, taken MANY different medications and had different reactions to all of them. Some good, some bad, some work for a while, some work for only a few days. The thing about Parkinson's is that it can affect different people in different ways. One of my father-in-law's friends has it as well, and has had it as long as he, but you'd never know it.
If you need more info, or just want to talk to someone about it, please feel free to e-mail me.