You are deactivating in the wrong place. If you want all of the bushes gone, always go to the root node. So all the way up until the master xform. One click here and it looks like ALL the bushes for the whole scene are deactivated.
Well its not a question of search or not. They have done the work. They have organized it to the root level. Take advantage. You always hide as close to the root as possible, xforms and all. Not just raw mesh.