It does mean that you'll get your old mail delivered to your old place forwarded to your new place while the other folks mailing you get their ducks in a row. And honestly I can't think of all the places that might mail me.
Compared to what seems like a big mess of telling only the post and hoping everyone will get the memo from them, telling the utility, my employer, family, and a few insurances that I moved (updating the info on the self-service site or sending support an email) seems like the better solution to me