Scott - a sequence of thoughts from your posting....I was at a seminar hosted by an "Orlando International" tower/approach controller.
He was growling about too much readback stuff from pilots and said that the best response to an IFR departure clearance, such as...
"Mouse 757, cleared to London via ABC, DEF, (airway) 1, 2 and 3 to GHI, after departure maintain two thousand feet, expect flight level one eight zero in ten minutes, departure frequency 123.45, squawk 1234"
would be.....
"Roger"
Is this correct? (I have this seminar on video tape).