This thought just occurred to me as I glanced over a notification that came in on another thread ("...there does not seem to be a way of seeing exactly which layout is in action for a page, even by inspecting the code." Source)
What about a new little icon in the admin menu that either links to a separate page or has a little dropdown info pane with details about the current page you are viewing?

For example, all in one place, info (and potentially links to edit/adjust) about the:
- Layout used on this page
- Theme
- Content type
- etc.
That may be overkill but thought I'd throw it out there to see what people thought.
Recent comments
I fixed it by disabling the admin toolbar and creating a couple of browser bookmarks for the functions I use the most.
User seeing admin stuff
Just to be clear, you are looking to proactively hide all block titles within a certain region? Hiding the block title on a specific block can usually be done through the UI, but I think...
How to hide block titles in certain regions
This one slipped past me and now a bunch of time has passed. Did you have any success figuring it out and/or replicating the issue?
User seeing admin stuff