Very true. If you as an instructor posses good trim and bouyancy, and teach your classes as if that is the standard(which it is), your students will naturally try to emulate your skill set. I'm not saying that all of them will be perfect, but the seed will be planted. During OW classes I don't really teach the frog kick or level trim other than a brief talk during the Classroom portion, but a hefty percentage of my students are emulating my body position and movements within 30 minutes during the pool sessions.
I am nationally certified to coach volleyball and soccer, and in the required training for both programs, the fact that students learn their skills primarily through imitation was hammered into us. It barely matters what you say about a skill--students will imitate what they see. Instructors need to be mindful of what they are doing constantly, and they need to make sure that any assistants they have are constantly looking like divers should look. If a student looks really good in the water, be sure to praise that student in front of the rest of the class--the rest of the class will watch that student, looking for a role model.