Simple but very handy: Outliner Model Preview is a Blender add-on that displays a small 360° preview when you hover your mouse over a model in the Outliner. Works without clicking, so you can quickly locate your model.
Developer Shuimeng is actively working on the add-on and just released a new update that adds preview support for instances, UI improvements, stability enhancements, and more. If you have suggestions or feedback, you’re welcome to join the Discord server.
Download Outliner Model Preview from Blender’s Extensions and check out Shuimeng’s other tools, like this add-on, which adds scale markings to the grid in the viewport, making it easy to see the scale of your scene: