Yes, the lack of a built-in project switcher is a nuisance. I'd like to have a little dropdown at the top of the (left) sidebar with project names. A keyboard shortcut plus a bit of fuzzy matching drops down the list and picks a project and pop all the files in that project are loaded right where I left off. Maybe copy a few lines to the clipboard, maybe add a TODO: note to myself that just occurred to me while working on something else, then a quick keyboard shortcut and pop I'm back in the other project.

Switching between multi-file projects should be almost as easy as switching files within a project.