@vnikolov A good use case for PROG1 is popping an item off a list L:
(PROG1 (CAR L) (SETF L (CDR L)))
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Right, and then that leads us towards Common Lisp's `define-modify-macro'.
Myself, I have found it handy also in Elisp:
(prog1
<set up a buffer, make it the current buffer, and return it>
<do things in the current buffer>)
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