The reason a checklist is used is to confirm that everything that needs to be done actually has been done. I'll not argue that those responsible for executing complex procedures or those rarely used need a checklist to ensure procedural compliance. However, I will argue that simple a simple checklists like our After Take-off checklist (Gear - UP, Flaps - 0) could and should be committed to memory.
The reason for this is that a Mk I human may start treating simple the normal checklist with contempt because of its simplicity. Once complacency sets in, the next set of checklist are the abnormals and emergency checklists. And these are vital to ensure a safe outcome following a non-standard/irregular event.
However, no matter what my opinion, I'll use a checklist at work because I'm paid to do so. Privately, I never used a checklist for normal operations.