The way that David Miller responded would match my sentiments exactly.I hang many stands that are of course at different heights and the terrain around them can be and is significantly different.In addition to that I am a one pin hunter,I want my sight picture to be as uncluttered as possible.I hold high or low depending upon shot distance,I can't gap pins if I am not certain of the distance.
I prefer my shots to be 30 yards and in but have shot a couple bucks that were just shy of 40 yards,no way that happens for me without a rangefinder.
I believe that most all of our range estimation is excellent out to 20 yards,some of us would be excellent out to 30 yards and most of our range estimation ability would deteriorate rapidly beyond that.
Of all the gadgets and gizmo's that we spend money on a range finder I believe is worth while.