Zoom to Artboard
This is an easy one. I don't love having to both select the Artboard that I'm looking at AND hit cmd-3 to zoom to its entirety, that's something I need to do very frequently (so that I can then zoom quickly to a specific area, or just view the totality of the board), so 2-3 steps feels unnecessary when it could be replaced with just one:
cmd-4 = Zoom to Current Artboard
"Current" in this case would refer either to the board containing your selection or the one that appears most in your viewport.
I’m leaving this open for now, but if you double click on the artboard title in the layers panel, it’ll zoom to the artboard.
Whit Gurley commented
Yes, but that's not the same - a keyboard action is much more efficient for something like this than a mouse action, and there's no reason not to add this as cmd-4 in the View menu options.