I have a lot of folders with a lot of documents in it in some of my projects. After working a while most of the folders are open which makes the whole draft in the binder very very long. Then I’m going to close all the folders, one by one, and every time I do this, I’m dreaming of one command that does this for me: closing all folders in one project with one mouse click…
Do you mean like View > Outline > Collapse All (Cmd-0)? 
You make dreams come true! Thank you! 
ALT clicking on the black triangles is also very useful.
Thank you!
I’d like to see expand/close all in context menu because when I need that, it’s because I want it to happen quickly, and going up to the top menu bar is a bit of a pain. It could replace “empty trash” which I think has no place in the context menu as that’s something that could have bad results if you click it accidentally. It’s potentially dangerous things like that which should be tucked away IMHO.
Im not sure about the philosophy that something earns a place in the context menu by virtue of being used by many people. Most people are going to close the program at some point, but you wouldn’t want that a single click away when you’ve just opened a context menu.
I can’t speak to the contextual menu, but there are three ways to expand all/collapse all; The menu, the keyboard shortcut (which is shown next to the menu item), or ALT-clicking on the parent container’s disclosure triangle. The latter two are pretty quick–quicker than choosing from a contextual menu, I would think.
Indeed, the keyboard shortcuts and the Alt-clicks are much faster than using a contextual menu anyway. As for “Empty Trash”, it’s not that dangerous, because you receive an “As you sure?” prompt. As for the logic of putting the most-used items in the contextual menu, well, obviously the open/quit commands don’t belong in there, but it would make a lot less sense to put the least used commands in there.
From Apple’s HIG:
developer.apple.com/library/mac … 7-CH30-SW1
The Microsoft Windows guidelines are a little more vague (and talk of providing contextual commands for advanced users - and expand/collapse all wouldn’t qualify there) but it’s clear that in practice, Windows apps use a similar criteria.
In my case that’d probably be safer. As it is with the keyboard shortcuts, I keep accidentally hitting Cmd+Q (close app) when I’m trying to Cmd+Tab (switch apps). 
Thanks for drawing my attention to this - I thought I’d tried ALT-clicking (and that it didn’t work). Just tried it again and realised I’d hit the wrong key earlier because I have a new keyboard with fancy extra keys down the side, so my left thumb was losing count, lol! Agreed: It’s at least as fast as a context menu, given that stupid user presses the right key 
“the keyboard shortcuts and the Alt-clicks are much faster than using a contextual menu anyway”
After trying this for a few weeks, I disagree.
“it would make a lot less sense to put the least used commands in there…”
A principle nobody had suggested in this thread.
“A contextual menu provides convenient access to frequently used commands associated with an item… Include only the most commonly used commands that are appropriate in the current context.”
Quite so. When the mouse pointer is being moved about in the binder, it might well be a commonly used command - IF we were allowed to use it, lol. Has any research been done or feedback solicited about what commands are most common and what would be if they were slightly easier to use?