Scrolling the folders panel via keyboard?

"And I cant widen this panel to see the names of the directories that LR helpfully created."

On Mac, hold down Opt while you drag the column divider to the right, and you can make the column much wider.

(That feature broke in Windows 10 and Adobe hasn't fixed it, but there is a simple workaround.)

[Use the blue reply button under the first post to ensure replies sort properly.]

[This post contains embedded images that don't appear in email. View the post in your Web browser to see the images.]

"My folders panel is so long, and the folders I think I want to see are below the bottom of the screen, and I can't find a simple way to scroll the view on a Mac."

The individual panels in the left column don't have scroll bars, but the entire column has one:

Ditto for the right column.

If you're not seeing that, please post a full-resolution screenshot of your LR window, so we're all on the same page of what you're seeing.

[Use the blue reply button under the first post to ensure replies sort properly.]

I sometimes find it useful too to move quickly from folder to folder and collection to collection, which is why I implemented that feature in Any Source.

[Use the blue reply button under the first post to ensure replies sort properly.]

The arrow keys are used for moving around the grid. Folder search has been improved. So if you know a name or word in a folder, type it into the search box. Lr will even find sub-folders.

"e.g. arrow up or down like you do in the Finder?"

The Any Source plugin has commands for going to the next and previous folder in the Folders panel (and the next/previous collection in the Collections panel). You can assign keyboard shortcuts to those commands (I've assigned Ctrl-N and Ctrl-P on my Mac.)

[Use the blue reply button under the first post to ensure replies sort properly.]

Not that I know of.