Jeff,
One item you left out on why pilots don't use checklists... THEY ARE TOO LONG! I did a ride a few weeks ago with a guy in a 172 Cessna. The checklist had over 100 items on it. I wouldn't blame any pilot for not using this checklist. A 414 I manage has a checklist with over 80 items on it... In contrast: My test card for a return to service after heavy check on an Airbus 321 only has 30 items on the complete flight test card. Our normal checklist for the same airplane only has 20 items for before taxi, before takoff and before landing combined... General aviation needs to get in the human factors circle.... Human Factors is the real issue here..