I would really like to see "Refresh" added to the toolbar. I think a lot of other people would too. 
Synchronizing changes with other collaborators in near-real-time relies on hitting refresh repeatedly. It's hidden behind a drop-down. Getting new users to refresh (or save) consistently as a matter of best practice has it's own challenges without forcing us to train users to look for the button first.
Yes, the save button is already there. It's not useful for giving me confidence that I have synchronized the sheet I'm looking at with other collaborators around the globe.
Hoping this is a simple change.