My answer is, "just the right amount" of course! It obviously depends upon what I'm flying. If it's my own plane, which only I fly, things go a little quicker sometimes. If it's a type I've never flown before I will have a thorough read through the flight manual checklist evey flight. For helicopters and turbine types I occasionally fly, full use of the checklist every time....
I once took off with great haste in my plane, to fly a man overboard search over our local lake. Too much haste... when I landed two hours later, I cold hear a tinking sound as I taxied in. It was the aluminum Cessna tow bar bouncing off the ground as I taxied in with it still in place. How happy I was that it was a night search, so no one could see it attached when I flew over!
I recall with amusement, a friend of mine known for very brief preflight checks. The staff at the airport where he kept is light twin, amused themselves by timing him from door closed to wheels off the ground. The plane did usually park within 100 feet of the button of the grass runway, so taxiing was short anyway.
It was reported to me with amusement one day, that he had just broken his own record, in being airborne within 28 seconds of closing the cabin door (with engines not yet running!).
To everything, there is a balance of too little, and too much...