Being an absent-minded photographer, I often end up taking photos using settings from a previous shoot. This is not a big deal when the previous and current scenes and lighting conditions are roughly the same. But when you try to take a landscape photo on a bright day at ISO 3200 and the aperture set to f/1.8, your end result will most likely disappoint.
Since there is no remedy for absent-mindedness, I rely on a simple trick to solve this problem. I configure the camera's settings that work for 90% of my shooting scenarios. Usually, it's the aperture of f/9 or f/11, Auto ISO, Single AF, center-weighed metering, and so on. Then, I save these settings using a memory slot of my camera, and switch the camera to the Memory Recall mode.
Now, when I need to shoot with different settings, I switch to whatever mode is appropriate (e.g., Aperture Priority) and adjust the settings at will. When I'm done taking photos, I switch the camera back to the Memory Recall mode.
When the situation warrants it, I change the settings directly in the Memory Recall mode. I call it the "disposable" mode, because as soon as I switch to a different mode and return to Memory Recall, the camera automatically resets all the settings to those saved in the memory slot.