As an aside to this and slightly off topic, I see two interesting trends happening, the first being the use of the word "midfield" as in XYZ joining midfield crosswind for runway 19. This is now so commonplace I hear it several times per day but a word search of the AIP brings up the word only twice in the entire 800 odd pages. Neither instance remotely relates to a radio call. Often the aircraft saying this are nowhere near the middle of the field either.
The other thing that is now commonplace is the acknowledgement of a transmission by a double key of the microphone. Once never heard, I hear this on an almost day to day regularity.
Again, I don't give a rats business, just saying what I hear and noting a developing trend.