I know exactly what you mean I am guilty of the same action. I have tried to control this by limiting the occassions when I am in a hurry mostly in the morning with the school run. I try to get up half an our early to make sure I am ready then I can devote my time to making sure my son is ready to leave when I am. Puting the clock 10 minutes eary also gives me a few extra minutes. Not fool proof by any means but it has reduced a bit of tension.