Jonathan, obviously for someone that shoots as much as you do, it makes perfect business sense. No argument from me there. My question would be, have your photographic skills and vision improved proportionaly? Out of 36 shots (1 film roll), do you have more keepers now then before? Blasting away at high speed motordrives is easy, but I prefer to photograph in a more "meditative" way.
Absolutely. One learns by shooting, looking at what you shot, analyzing what worked and what went wrong, and applying that to future shooting. I don't use motor drive that much, I compose and shoot each frame individually 99% of the time. I do shoot a lot though, and the experience has definitely improved the "keeper" rate. I shoot a lot of concerts and events, where a slow contemplative approach means you'd miss a lot of stuff if you had to set up a tripod and take 11 meter readings and fuss with the focus for 2 minutes before firing the shot. What makes the difference between a keeper and a clunker for me now has more to do with things like the subject blinking as the shutter was pressed, or someone walking in front of me, a band member moving unexpectedly, etc. The experience I've gained from shooting that many frames means I can go in and shoot and be confident in my technical abilities, and select shots based on best facial expression, composition and the emotion of the moment rather than on whether I manged to get the exposure and/or focus within reasonable limits. That means I can catch grab shots that a contemplative approach would totally miss. Here's an example:
I shot this at a wedding; as the bride was getting ready, one of the bride's friends came in with her daughter and the daughter sat down for a moment. The only reason I got this was because I was technically prepared and all I had to do was briefly AF and hit the shutter.
If I'm shooting pruducts in a studio type setting, I won't shoot very many frames; I don't need to for that. If I'm doing a series of similar items with the same lighting, I may only shoot one frame per item once I've got focus, exposure, and lighting dialed in. It's a different approach for a different situation.