Better they stop the cart, look for a yardage marker pace off the distance and then do all the other things you mention?
I pull the cart up to the ball, I can get the distance from my rangefinder and put it back in the case in less than 15 - 20 seconds total, much faster than using yardage markers.
You don't know that.
I've seen college tournaments where it definitely speeds the pace of play. I've seen PGA Tour pros using them quickly and efficiently in events.
I'm not guaranteeing it, but you no more so know than @Pretzel or anyone else knows.
I can say that in the biggest events in which I've caddied, such as PGA National Player Championships and the like, we'd just use the laser for yardages and the map for locations and relative distances. If it's 176 to the flag and a tier on the green is marked as 6 on, and the pin is back 18, we'd be able to do that math quickly without having to pace off landmarks. Lasers are more accurate than my paces… and I practice (dating back to when I was a kid) my one-yard paces.
Tied my personal record of 83 from my home course. It lowered my HI by 1 full point. Scored 37 on front 9 with 5 straight GIRs at one stretch. After par'ng 10th hole for +1 through the 1st 10 holes, I was on top of the world and begin to dream. Then, I came back down to earth and played the remaining 8 holes to my HI level.