Sports. I bought an autowinder for my Contax RTS and it was a huge help if for no other reason than I didn't jostle the camera when advancing. It was too slow for much else but once in a while it came in handy. Then I bought a Canon 7ne for shooting hockey games which was dramatically faster. Lastly, a few years back my neighbor gave me his Nikon F-100 and it's amazing. The frame advance is great. So handy for all sports. (Also handy that it takes all those old AIx lenes.)
Of course having said all that, the two best action shots I have were taken with an old Yashica FX-2.