I tend to use Gil Toss on Yunalesca if I neglected to grind beforehand. It just always ends up that way! Mad Rush and Assault are good for random encounters where you're just gonna X it the whole way through. Status effects were very useful in FFVIII, and somewhat in FFX. Summons were done best in FFX, though maybe a bit overpowered. I also used them in FFXIII in emergency situations.