I worked manufacturing for a couple of years, was on my feet all day, and yes my feet absolutely got bigger (I'm 27). I mostly noticed it in the width around the ball of my foot (the width around my heel largely stayed the same) and in the total length. I had to get rid of (literally) all of my old shoes and buy new ones because my feet felt crunched in every pair I owned. I went up probably 1/2-1 size.
Keen shoes are my saviors. With the wide toe box, good arch support, and asymmetrical fit, I hardly notice I'm wearing them.