I tried the trigger control experiment that GJM suggested. I did one shot draws to an 8" circle at 7 yards, first attempting to stroke all the way through the trigger in one continuous motion ('slap', in this discussion, and the way I would normally address this particular size/distance of target), then doing 'prep/pull', where I get past the slack and then pull through the pressure wall in its own distinct motion, then 'prep/roll', where I get past the slack and then pull through the pressure wall more carefully.
I only did a few repetitions of each, but as might be predicted, the times ascended as I was progressively more careful on the trigger.
"Slap" saw an average of .81, 'prep/pull' an average of .91, and 'prep/roll' an average of .96.
Doing this, I could see just how much I have become semi-conscious/unconscious in my trigger control, and how much I have been devoting my mind to the visual parts of shooting for the last couple of years; I had to really try in order to pay any conscious attention to the trigger press, and I found it a little distracting trying to do so.
I also shot a few repetitions of an abbreviated version of the Accelerator drill - two shots each at USPSA lower A zones at 7, 15, and 25 yards, all shot near to far. I found myself doing continuous trigger strokes ('slap') on the 7 yard target, and simply by being more careful on the 15 and 25 yard targets, going to what could be described as 'prep/pull' and 'prep/roll' respectively.
It is a very interesting exploration. I think there is a lot lost in the translation of the idea from one mind to another. If you asked me a week ago how I pressed the trigger, I would have simply said 'with continuously increasing pressure.' And I'm not trying to get away from that concept. But I think I can now see how the descriptions under discussion could be used to describe what I do. This discussion is not changing how I work the trigger. It is making me introspect, examine ideas of trigger control, and pay more attention to what I am doing with the trigger. Surely that can only be good.