I have remapped my right-option key to (left-)option + space for Alfred, so I use that one … a lot.
And I’ve remapped my right cmd key to a hyper key (shift+ctrl+opt+cmd) so I also use that one for lots of shortcuts. One of my most-used ones is right-cmd + I to open my “inbox”-folder (which is also my Downloads-folder).
I often use that one even if I actually need another folder, just because it’s a quick way to open the Finder.
One of my favorite “hidden” shortcuts on the Mac is the option-key when using cmd + tab. (And for many non-power users “cmd + tab” is my favorite shortcut to show them.)
For example: if you use cmd + tab to go to the Finder without any windows open, and you hold down option before you let go of cmd, it will open a new Finder window for you.
If you can get that in your muscle memory it’s a quick way to open up a new Finder window.