In the menu Go > Recent Places you can get a list of recently accessed folders. I want to add this to the Finder sidebar, but I am not seeing any clear explanation of how to do this.
Use a smart folder.
- Right click the Finder in the Dock
- Select New Smart Folder
- Press the plus button
- Select kind.
- Select Last Modified/Opened or whatever you want.
- Select 'This Mac'
- Save your smart folder. When saving, make sure 'Add to Sidebar' is checked. Name your smart folder and you're good to go!