Ah, Heavy Horses! Draft breeds are great. When I was taking lessons, my favorite breeds were Lusitanos (Baroque Spanish breed, not draft), a Belgian-Tbred cross and a Percheron-Tbred cross. The tallest of my steeds was about 18 hands.
Here is a Shire - he is 20 hands at the shoulder, so about 6 and a half feet - about 8 feet at the ears.
They can be intimidating, but are generally Gentle Giants though - very steady and reliable. The Draft crosses I rode really enjoyed their work (jumping) and in warm-ups they would canter around the ring with long powerful strides until you said stop.
It felt like the Middle Ages. :)
An Ode from Jethro Tull