All of my pro-caliber -- or even semi-pro-caliber cameras -- have motor drives. Nikon F2s, F3, F4, FE, FE2, Canon F-1s (new and old), A-1s, And when I use a motor drive, I don't set it on S. I set it on C. I shot motorsports for years. Frequently I had to capture shots of race cars zipping by me at 200+ miles per hour. For that sort of action, you develop panning skills, and you remind yourself (back then) that film is the cheapest component of a shoot, so you use as much as you need. And that's what I did. Now most of the time, I was shooting single shots, but if I felt the need -- like seeing an accident unfold, for example -- I'd hold the button down. Sometimes you have to hold the button down to capture shots like this:
Porsche-powered March 83g at an IMSA race, Riverside International Raceway. Canon F-1 (with MD MF), Tamron SP 60-300, Kodachrome 64. This is
not a crop.