Regularly flying 100', no: but whenever we do lifts these days we tend to use the 100ft line from preference. Downwash, access and suitability all play a part in which length line to choose, but it is always noticeable that it takes a couple of lifts to get accuracy, if you haven't done any lifting for a while.
Like any skill, it's always there when needed, if you have developed it along the way. Remote Hook, the AS350 has a floor window mod on the RH pilot's side, supposedly to allow vertical reference in sling work. From what I understand, tho', it's not much cop for long line work.