I can understand why you may think that...let me give my take. Since I started working out with DVDs, there is a certain ambiance that is created in each. For me it's a little escape into someone else's place, for instance, the Body Blast series always has a beachy feel to me, Bodymax 2, that woodsy cabin-like, yet the music has some city-like sounds in the beginning and the songs that just draw me in. It's all very motivating.
There are other instructors I like that do this really well too, you just know they put thought into what they were creating. In addition to the set, backdrop or not, and music, lyrics or not, the crew or instructor adds in another dimension. That can be a gym setting, outside, whatever.
I thought about these things when I did a short bout of strong lifts barbell work, like Starting Strength, the simplicity of just lifting, straight heavy lifting is very appealing. Sometimes that is what I want, or relaxing meditative yoga. I really started with Cathe though for the whole package, the workouts, her, the crew, which are quite awesome this time around too, and the music.
Nice explanation of that perspective.