I am not sure I understand to what problem this would be a solution to.
Numbers are completely non-descriptive. I don't believe it is that difficult to learn what things as 'Album cover', Lyrics', 'Column Browser' etc. etc. are.
Also learning the concept and locations of 'Left Sidebar', Left Main Panel', 'Bottom panel', 'Floating Panel' etc. can't be that difficult?
Two things you mention that I do agree on are:
- keeping all optional elements always displayed on the right, so it will give a good overview of all the available elements, which will also make it easier to learn and understand.
- dragging and dropping the panels themselves. This might be nice, but far from an essential feature. You couldn't drag panels that are not displayed at that moment anyway, and what would you do with stacked panels, tabs etc.
And, both these two requests/suggestions belong in the wishlist.
And in fact, they have already been posted there before.
So instead of posting this here, it would be better to just +1 these already existing wishes/requests in the applicable wishlist posting.
edit,
To prevent you wasting your time on searching the wishlist for these, I might be wrong, and these wishes/requests might also be buried somewhere in the "GUI changes for v3.0" topic.