Avoid being complacent - Use checklists
A pilot parked an aircraft (a Cessna 172) at my home airport without enforcing a simple policy which is appropriately securing the aircraft wheels with required chocks and came back to find out that the aircraft became totaled and the only way to get back home was by a rental car (more than 5 hours of driving). The aircraft rolled back and hit a wall resulting in the destruction of the aircraft empennage structure.
Another pilot (a Cirrus pilot) learned a hard lesson when he forgot to remove the towbar before engine start and the resulting prop-strike was disastrous. Thousands of Euros lost due to complacency.
Both scenarios were clearly avoidable by following the checklist.
I use both written and mental checklists all the time and it is a safety resource that I can't abdicate from using.
It is my understanding that using a checklist minimizes flight envelope risks and has little to do with simplicity of an aircraft configuration or complexity. The checklist is there to align the execution of operational procedures at appropriate times.
I don't see any reason why checklists should be "ditched" out.
Eliminate complacency from the cockpit!
WP