While beautiful in a clump like this, the flowers of the Aloe aren't what make the plant so popular. For many years people have believed that the gooey inside of the super-thick super-spiky leaves (see this photo) have certain medicinal benefits.

Today you'll find many after-sun lotions, anti-eczema creams, etc. in South Africa (and perhaps even in your country) referring to Aloe as a primary ingredient.

Possible medicinal benefits aside - isn't this just a beautiful cluster of flowers?