I’m glad QCD helps you. 
@BlackRainbow
For the record, because I didn’t state this very clearly before, disabling QCD in the addon’s preferences will remove that widget from the header, leaving you with just the collection management via the main popup.
Since you and @BlackRainbow seem to work with complex scenes I invite you to leave some feedback at either my feedback thread here or the development task. The Collection Manager is designed to make working with very complex scenes as quick and easy as possible, so if there’s some cases it doesn’t work that well or if there are things you can think of to improve it, I want to know.