Absolutely not, they will not help the typical Jeep driver. Slotted, cross-drilled, or dimpled rotors are meant to help off-gas rotors for racing applications. Brakes that are uber-hot from racing applications off-gas and that's what slots, holes, and dimples are added for... to help get rid of the gasses that can reduce pad contact.
For normal driving, especially on a Jeep, they absolutely will not help reduce braking distances. As a matter of fact, the more material that is removed from a rotor by slotting, drilling, dimpling, etc., the hotter the rotor runs due to having less mass to help dissipate heat which can promote rotor warping.
You want the most possible swept surface so at least for a Jeep that is not being used for racing, a solid all-cast rotor will provide both added resistance to warping but the best possible stopping.
About the cheapest thing you can do to obtain a tad better braking performance is with carbon metallic Performance Friction pads like you can find at Autozone.