Unless someone really has control of their distances, I hate it when people use their range-finder for nearly every shot. Even without pacing off distances, it's usually pretty easy to tell how far away you are within 5 yards or so, and no one I play with has accuracy to within 5 yards. Every once in a while? Sure. Every shot? ....pet-peeve.
I also like to play ready golf, and, apart from the tees, I hate it when my playing partners try to play 'honors'.
And while I'm okay with people taking a practice swing or two, I can't handle three or more --- especially if it is for every shot.
...but the biggest one of all is: when someone lines up a ball, takes two or three practice swings, addresses the ball, and then stands up, and starts lining up the ball and taking more practice swings again! (And my regular playing partner does this frequently. Grrrr.....)
I personally hate range finders. Not because a lot of people do find them useful, but for precisely the reasons above. First, people I'm playing with at my home course are obsessive about helping me with it, to the point I am getting ready to swing and they push me aside to "help" me. I already know the distances important to me (to the center, and for a forced carry, the yardage to the front of the green). It's annoying because I have the notes and experience to know how far I have to carry the ball and especially on tees, it's the same shot as last week...and the week before...and the week before...
Second, if you have to do it for a 40 yard shot, why the heck are you out here? Everyone I know struggles with the touch for a shot like that. And no one can tell me how far back the club goes to achieve that distance...so why are you wasting my time?
I'll tell you why...more information does NOT always mean better results. You can have all the info in the world, but if you don't know how to apply it then you're still screwed. You'd be better off doing it by feel, or yardage to the center.
For people who can process that data and use it effectively on a 40 yard shot, good for you. You have a better grasp of things that most of us. I truly mean that. There are people who know exactly what to do with their swing with that data. Most people are being goofy pulling it out at that yardage. Go take up bowling and get the heck away from me.