For some reason helicopter pilots are the worst offenders...... Something about moving and talking at the same time.
Seriously, I first ran across the speed fetish when dealing with artillery; "fimisson grid oneseveny blahblah" and its an affectation that is relatively harmless when both you and the intended recipient know what to expect from each other.
However if you are asking others to listen to your broadcast for the purpose of maintaining situatoinal awareness then some pilots are asking for trouble.