My dad had a tremor that would shake the table, but now he has virtually none. I'm not sure of the time-lines - it probably worsened over 5 - 10 years, and then lessened over 2-3 years. My mom thought he'd "gone into remission". I read somewhere that it's not unusual for a tremor to lessen as the years go by, but I have no idea where I saw that.

Too bad we don't know why - I'd much rather be stiff than have a bad tremor (I think!)