HTTPie is amazing for working with JSON/REST interfaces. It's really succinct and generally designed with user-friendliness in mind, versus supporting every nook and cranny of the HTTP RFCs. It's installable via homebrew for Mac users.

Whenever I go back to curl I feel the same minor aggravation I do when moving from homebrew back to apt (want to install? apt-get. Search? apt-cache search. List? dpkg. Remove? apt-get again, for some reason). It's just not a very user-friendly CLI and I'm constantly pulling up the curl man pages.