Rainboe,
I was of course grateful for your taking the time to answer the question.
I asked whether the practice was the symptom of a rushed take-off because it can appear that way to passengers. I remember when aircraft always waited on the runway before taking-off.
To clarify: by "rushed" I did not mean to imply inept piloting. Instead, I thought this practice may have been the take-off equivalent to the intensive-braking used to vacate a runway quickly when aircraft are waiting to land.
It is clear from everyone's answers that the practice is standard.
It was certainly not intended to be offensive.