I don't think this is an isue with any organization, but an issue with persoanl skills. Go take a clinic with a d-teamer. You won't stand around and talk much. If you have too many students for a single chair ride, you can make 2 quick runs working the same issue and (as the clinician or instructor) make sure you ride with the other people on the 2nd ride.
The big issue I see, is with less experienced instructors, up through/including L2 certs with fewer years under their belts. They are looking for positive verbal feedback that everyone in the group "gets" what they are saying while they are standing in the group. When they don't get that immediate feedback (exaggerated nod or people saying "yes, I get it"), they try to explain it again.... and again.... and again. I've observed clinics where I've stood there and almost pulled my hair out as the instructor went into their 4th explanation of the same thing while the non-verbal cues from the students were screaming "let's friggin ski already!". They haven't yet developed a process of communication where they are able to say what they mean, mean what they say, and ski it, then observe the students to decide whether they got it or not. Then, if not, have another quick way to describe it. They are so afraid people will not get it on their first attempt, that they subject them to this barrage of words and possibly conflicting mental images.
Another issue with the same instructors, is that they are not yet proficient in communicating things other than verbally. If I'm able to show it to you, and exaggerate it or do whatever necessary for you to see it, or to phisically manipulate you so that you can feel it in a static environment, I'd rather do that than try to create mental images that I hope match mine (but don't really know). I've caught myself a number of times starting to explain a task I want the students to do, then just stopped myself and said, watch xxxxxxx, and do what I do. 90% of the time, they get it. For the 10% that don't, I can explain it in words or through physical manipulation to that person while the others are practicing.
I have found that one good way to coach instructors is to get them out of the normal command/task mode and call-down and follow-me stuff. For rookies, do some circle skiing. Start out saying "Look at me when I pass you, and try to figure out what I'm doing, then you do the same thing when it's your turn, and each time I pass you, I'll be doing something different. Also observe the other people in the group and see if they are doing what you thought I was doing". This teaches rookies a lot of good stuff, such as basic movement analysis skills, good teaching skills using non-verbal communication and other ways of teaching groups without the call-down or follow-me methods, while keeping people moving and involved. For rookies (heck, for anyone) it's a good idea to make them aware that you are intentionally keeping them moving and involved by using these other methods of teaching. And at the same time, they actually learn skiing skills for whatever it is you are actually doing in your turns.
This can be done in small groups of any size as well, either by circle skiing (for larger groups) or skiing closely as a group and having one person ski some specific way and the other(s) follow and observe, and maybe try to emulate.
Even in level1 (beginner) lessons, you don't need to tell them what to do all the time. Just show them. If I'm doing a straight run and stepping from ski to ski or a thousand steps turn, it's pretty obvious what I'm doing. There is no need to spend 1-2 minutes explaning this.
However, I have also run across students who just want everything explained in words. It messes with things a bit if it's not a private lesson, but you can usually figure out a way to make sure everyone keeps moving and involved while this person gets the words they need. I've even taken people like that, who have said "I want to know why and how, and have it explained in detail", and just said to them "do this first, and I'll explain it later." and had it work out very well.
I forgot... (as if this wasn't long enough already).... I ski once in a while with one of the epic regulars who is not an instructor. We skied together a couple weeks ago, and he said that even after all the words we had typed here about crossover vs crossunder, he still didn't get it. So rather than explain it, I just showed it to him. It took no words, and 6 demo turns (3 crossover, 3 crossunder). His response to seeing it was "oh, I get it".