If you know that you are loosing time when having to cast a spell by pressing it’s key twice, you’ll love smart cast.
Yet.
Smartcast won’t allow you to see your cursor, unless you implement that awkward feature of pressing the button too long to see the spell radius.
In order to smartcast often, while having the chance of aiming your spells when you need it, just do this simple bindings:
Bind your smart-cast to your spells keys.
Bind your “targeted cast” to “Shift + spell key”
This way you can always smart cast and if you are used to pressing shift while playing you’ll be able to aim very comfortably.