if you are going fast, nothing is done wicked quick..like no jamming the front brakes, no snapping the bike over.. it's a controlled snap for lack of a better description? yes, you have to get it on the edge of the tire as soon as you can, but as you are suspecting, harsh inputs unsettle the bike, and can have you run wide or waiting to get on the gas, missing apexes, etc.
Also of much importance, are turn in points, brake markers (either some permanent landmark or actual "4-3-2-1" markers"), etc.
Watch the AMA supersport class, or world supersport. They look SOOOO smooth, you would swear that with a few courses, a night at a Holiday Inn Express, and a Red-Bull you could run laps just like they do. Negatory.
If you look close-er, you will see them occasionally pushing the front tire, and big rear slides from engine braking/rear brake (those are not so hard to see.. ). Absolute, on the limit, front tire pushing madness. The fastest 600cc riders have amazing feel for the front end, as it's all about keeping momentum up as the bikes are so equal. That means running into the corners crazy fast, but to not lowside 5 times a weekend, you have to be SMOOOOTTH. Smooth but deliberate with inputs.