Question: Do I miss something by not using Postman? My alternatives for development are "Edit and Resend" of a request (in Firefox) and plain old curl scripts for reusable examples.
Not Postman specifically but a client like that will allow you to prepare a whole set of different requests and save them so you can build up a test suite, plus some of them do things like scripting, chaining requests together etc. It's like the difference between a text editor and an IDE, so it depends on your needs really.