We’ve just added the ability to hide individual objects in the Scene view. You can Hide Selected Objects, Hide Unselected Objects and Show Selected Objects from the View menu, or from the context menu in the Outline panel.
We keep a history of the batches of objects you’ve hidden, and you can bring back previously hidden objects by selecting Show Last Hidden Objects until everything is visible again. Or you can Show All Hidden Objects to bring everything back into view again.
Objects that are hidden this way will appear dimmed in the Outline panel. In the future we intend to add toggle buttons for visibility directly in the Outline panel, but we wanted to get this feature out as soon as we had something working.