Though I do like having the open views, scripts, queries, etc. available as tabs at the bottom of the Designer I prefer to navigate using keyboard shortcuts as much as possible.

I would love to see Ctrl+Tab added as a shortcut to switch between these tabs similar to how it functions in SSMS where, rather than switching through in the order they were opened (like Chrome), it keeps a history of the latest tabs you've viewed and switches to the last viewed tab.

This would be sufficient if it functioned independently within each designer context (i.e. Perspective, Named Queries, Scripting), but it would be a nice bonus if this could also switch between these designer contexts.