Unlike most people, I use summons, limits, and drives constantly. It provides an extra flair to the game, makes it more flashy. I especially like Dumbo and Simba in Kingdom Hearts, and Genie in both (actually even in Re:CoM as well). In Kingdom Hearts II, the summons were different, and required some skill to use. I liked Chicken Little and Stitich.

Simba's Limit was neat, as well as Auron's. And I prefer Wisdom Drive to the others.