21. Search outside of Drive
As long as you're signed into Google, you can search through your Drive content even if you aren't in Drive itself. Try typing queries like "my tax documents" or "my income spreadsheets" into Google Search (or into the address bar in your browser, assuming it's set to use Google as the default search engine).
If you have an Android device, you can also use the Android Voice Search function to complete similar searches by speaking into your phone or tablet.