My AF cameras rewind fully, but that's a pest for home processing.
Ahhh, Canon EOS-3 and 1n, custom setting 2, set to 1. Leader out. Then, crease the end of the leader and drop it in the film canister.
Back when I was shooting on the cruise liner though, rattling through upto 20 rolls off 35mm per sitting, 2 sittings a night, it was basically 2 lowepro "pockets" on my belt, left was fresh film, right was exposed. Take a roll out, load one of the cameras, shoot, when it ran out use the other body until you finished that table, then reload the camera that'd rewound by then, and dump the roll straight into the right hand pocket. My co-photographer would be running between the dining room and the camera-shop/photo-lab, taking exposed film and bringing fresh, and loading a couple of reels into the mini-lab so that we had a head start on processing. To say it was somewhat fraught is a bit of an understatement. We HAD to have the shots dev'ed, printed, decollated (cut up off the reel) and onto the photo easels by the end of the evening shows, so that punters could come and browse their shots and take the ones they want (charged to the cabin) the same night if they so wished. Most people ended up coming in the following morning, either before or after breakfast, but we were contracted to have the shots up in the evening - as people with a good meal and a few drinks tended to "spend" more...
I have to say, compared to working on film, shooting digital and using touchscreen displays and print on demand would be a doddle in comparison - just the "waste factor" of all the pictures taken, printed, and never even looked at by some of the persons on the cruise was ridiculous...