I have an MD-4 motor on my Nikon F3. It's my only motorized camera and it's usually set on 'S' instead of 'C' unless I think I'll need to take a quick sequence. At roughly five frames per second, 'C' is indeed a film burner! But I like using the drive, because I can keep the camera at eye-level while winding and I find the shutter release slightly more responsive. Also, the F3 handles nicely with the drive attached, especially with a moderately large lens.

As noted above, it's a tool.