I've only started playing golf seriously over the last 11months, before that was maybe once a year with friends. The first 6 months for me I played without of gps/range finder or even really markers at all. I was out there trying to learn distances, find my swing and have a good time doing it (not just using the range).
Now after joining a club my focus has changed to improving my game, lowering the scores and a big factor for me was my GIR, so I started paying attention to the markers to get me in the rough vicinity of the correct distances. I got a range finder 2 months ago and it has helped me heaps. Posting better scores based on knowing the distance I needed to carry hazards. I'm off 14 and I don't shoot the pin because my golf just isn't there yet but knowing distances to/carry hazards gives me a better shot of hitting GIR and ultimately playing quicker. I was a fast golfer before the range finder and I'm still a fast golfer with the range finder.
My grandfather doesn't use a gps or range finder, he just pulls of years of playing experience, but he also can't figure out my iPad. Times are changing and we live in a technology based world now with the need to have the latest toy, change is good, it promotes growth!