UPDATED: Multi-Item Edit v4.2
Multi-Item Edit is an applet that acts as an alternative to iTunes' "Get Info" editing panel:
You can read more about it on its product page, where there's also a quick YouTube video explaining how it goes.
This latest version fixes a problem with changing Last Played and Last Skipped dates in single-edit mode; fixes a logic issue with auto-setting checkboxes; worksaround issue whereby iTunes Match tracks might be ignored; fixes an issue with toggling Information Tracking; and has preliminary support for OS X 10.11 (El Capitan) beta.
Multi-Item Edit is free to try for ten days, $1.99 thereafter.