My 'feeling' is a huge amount comes down to the experiance of those on the boat .
With the ribnobbers we all know what to look for so know what to expect - so comms become more of a catching the eye type to confirm whats going on.
With fmaily the 'WAVE' shout is also used to mean something is going on thats not expected / could be interested.
'HOLD ON' is what I shout if I have to stop or go quickly for any reason - but generally if its going to be in any way 'exciting' on the water everyone gets a brief before departure to always be ready for anything .....
'ALL OK' gets used to seek a posative response if 'cruising' - much like a sailing 'ready about' shout ...