In my book, "iron" is a "four-letter word" of the foul kind.
I don't iron. I buy permanent press. If it says "iron, hand-wash, hang to dry, dry flat, or dry clean only," it STAYS IN THE STORE!
Take your perma-press items out of the dryer as soon as the cycle finishes, and hang them up at once. If you miss the end of cycle, and find something has wrinkled, put it back in the dryer with a damp towel, and then, this time, get it out immediately.
To pack in a suitcase, do NOT fold, but roll...(I have an article on here on how to pack a suitcase). Rolling creates far fewer wrinkles than folding.
When you are away from home, and no dryer is available, hang the wrinkled item in the bathroom with the door shut while you shower, or just turn on the shower to hot and let the steam build in the room. Allow the shirt to hang and dry (it will get only very slightly damp), then put away or wear as usual.
Donate your iron to a charity. (I use mine only for iron-on patches or pressing open seams while sewing these days.)