You don't need to write macros to write a loop. What you probably do need is macros to create a new looping construct of your own... but it's not practical or idiomatic to do that in the first place in other languages.

If you want an "until" construct in Lisp, you can create one with macros easily and doing so would be considered fairly kosher. If you want an "until" in C, you could swing it with macros, but you'd be told to buzz off when it came time to receive code reviews for it.