How can I use emoji on my Mac as easily as I can on my iPhone?
You can use the Mac Emoji keyboard. All you need to do is press the command + control + spacebar keys and this brings up the following:



Once the Emoji keyboard appears, just click on the emoji you want to insert!

NOTE: - For the emoji to actually insert, your cursor needs to be located within a text document, text field, search field, etc. Basically anywhere you could normally type text.