I would like buttons in the grey block above the track headers to minimize/restore all tracks. Maybe there could be right-click options for folder handling.

This would be SO useful! It's not there already is it?

You can save any current window layout as a screenset (Ctrl+Alt+F11). IIRC, you have to unlock the screensets before you set it up, lock when finished. Save the two you want to these locations, and toggle back and forth between those numbers (1-10). I LOVE screensets. I have sets for midi tracking, audio recording, mixing, mastering. Indispensable for me.

I wonder if this works as a Quick Group function - Ctrl+A (or Edit > Select All), then Ctrl+Click the minimize/restore button?
 
I do something similar for manually changing all track heights by using Ctrl+A then Shift+dragging one track's height to an appropriate size; all tracks follow suit.
 

Neither of the above approaches work. Please up-vote if you would like a minimize/restore all tracks button. Would save lots of clicks and window resizing.