If you don't use shoe trees, you should start. Like, yesterday.
That's because they're one of the best things you can do to prolong the life of your expensive lace-ups. Put them in once you take off your shoes and they'll maintain the shoe's profile and freshen the insoles by absorbing odor, so your shoes stay in terrific shape. You'll be glad you bought a pair when your favorite wingtips still look supple and full years after you bought them.