I have my rangefinder EVERYTIME I go into the woods. My deer last year was exactly 18 yards when I shot it. I ranged it and then shot. Hitting right where I should have. Could I have estimated and still made a good hit. Probably, but with technology, why even enter "chance" into the equation.
Perhaps if you hunt the same stand you can becoome comfortable with known distances. But if you move or set-up differently with a climber, why not take the few seconds to hit a few lanes with the rangefinder? Jeff as a golfer you know that as a rule, people are not that good at estimating yardages.
Now the seaon has progressed and the leaves are falling, suddenly everything "opens up" and looks closer. That rutting bruiser is heading your way. Is he 28 yards oris he 35 yards?? You are gonna aim a touch low in case he ducks the string. Which pin you shooting? 1 may result in a miss.