Using Shift-H you can hide all but the selected item.
Using “.”, you can focus the selected item.
Using “Numpad /” you can go into local edit mode.
Combining these into one option would be pretty cool - call it “Isolate” mode. Have it remember what objects it hid, where the camera was, etc - so you could select it again - and get back exactly where you were would be be cool too.
Sometimes there are features that I’m not aware of - so if there is already a mode like this, let me know. If not, I’m thinking about dusting off my python skills.