What are World Object Tooltips?
On standard melee maps, this option applies to:
- destructible rocks
- Xel'Naga Towers. Tooltip: "Provides vision to nearby units".
- neutral bunkers
- Unbuildable Plates. Tooltip: "Unbuildable Plates".
- Debris. Tooltip: "Attack this to destroy it".
But not to things like
- critters
- minerals or gas geysers
I'm concluding that the option only applies to map elements which are interactive in some form.