I too learned on film cameras (my first camera used 127, but the idea is the same), and since I'm primarily a film photographer I never developed (ouch!) the habit. I have nothing against those who do (with a few exceptions - see below), but I have a good idea when I make an exposure what parts of the scene are going to be what values in the negative. I expect that checking each shot would be a good learning tool for those who are not as familiar with their gear, the settng, etc. No waiting for the film to come back to check it against your notes and what not.
The one time that I was bothered by this type of activity was a professional photo shoot (a graduation) where the lighting was the same for every exposure, the people stood on a mark, and the person taking the shots played with every, single, one - EVERY, ONE, holding up the progress and causing the event to run over by almost 45 minutes. In that case the person in question should have set their equipment, flashes, bounces, umbrellas, whatever, before hand, tested it on an assistant or volunteer, and then worked the job knowing that everything was already configured properly.
- Randy