There’s an extra option bar in the Layers palette dedicated to sorting out and displaying layers. To start, layers can be displayed by what type they are.
You can select one type or combinations by toggling them on or off. As soon as any are selected the overall on/off switch is active – it’s the red slider in the corner.
The fun part is tagging layers with colours – like red if you aren’t sure about whether it’s a good idea. Then the Sort criteria can be Color: Red to display those in question.