Most of the time we daisy chain from one deck into the next. Keep in mind when the guy at the head of the line makes a level adjustment it effects everyone else downstream. I'm usually the guy at the head of the line, and I just don't make any adjustment unless I'm clipping hard. Also, it puts a certain amount of stress on the guy at the head of the line... if he had a failure, so does everyone else.
I have a pair of XLR splitter cables and a pair of RCA splitter cables, and use them occasionally. It helps to avoid political hassles when you get strong personalities, rather than decide who is at the head of the line, you split it off. I think I'm the only person I know who carries them though.