I have some 3"-4" leapord print heels, i'm 5ft10, so I don't really need the extra height (he's 5ft11) BUT when I feel like dressing up and waiting for him to come over, I'll slip on a black top/jumper dress/cami (get the drift) and wear my heels with it, perfect finish to the outfit.
Heels are perfect to hold onto, when you need that extra help to keep hold of a position, they make your legs look even better with them on (well, mine anyway lol and when we're doggying, I can stand and hold a perfect position. He also loves me holding my heels, when he's behind and i'm on my knees.
They don't come out to play all the time but when they do, I think he gets more pleasure from viewing them on me, than I do wearing them lets face it, they'd cripple you on a night out on the tiles lol)