I wait until all of my tax statements are sent through the mail and then make an appointment with our tax service person. She is an EA, not quite a CPA, but she is very knowledgeable and does the job very well. I don't wait until after Feb 1, I call right away.
I usually wait until the first of April. I don't put it off until the very last minute, but I do put it off to the point where I have to have a sense of urgency when I do get started. It motivates me I guess.
I always do my own taxes and my families because I'm an accountant too. As soon as I get all of our forms in I start the process right away. We are normally the ones that get our return back the second week of February. Of course, I guess it would be different if we owed money; then I might wait until April to file them.