The default tags are pretty lacking. Tags like "Moody" and "Fun" are good for a music search, but not builds. We need a wide variety of precise types of objects. Not just vehicles, but cars, trucks, planes, helicopters, spaceships, trains, etc.
This is especially necessary since you can't search for "Train" and get everything on the workshop that's a train. Most builds aren't named "Car" or "Truck," they're named "Ecto Mobile" or "Troop Transport." Builds named after specific things simply don't show up when searching generally.
On that note, there should be an option to search descriptions as well as titles, and it should be enabled by default. So many important words about what things are are in the description and they just don't show up.