I visited this WHS in June 2019. I opted for a VERY long day trip from Lima and combined a birdwatching boat trip to Islas Ballestas, a land panoramic lookout stop of some of the older Palpa lines (the Paracas Family, the Voyager, etc.), the Nasca Watchtower (really nothing special compared to the airborne view - another metal watchtower has been built in front of this one which is even worse!), and last but not least the Nasca Lines flight.
The mystery of how these geoglyphs were made, the sheer size of them and the endless amount of geoglyphs all add to make this WHS very unique and special and a must-see in Peru. Allow enough time to get there before your established flight time and make sure to add 5-10kg to your declared body weight. Apart from the extra kilos you might gain while in Peru, the personnel will NOT exclude your hiking clothes and shoes weight when checking, which might mean you'll be placed on a different flight or separated if you're with friends or family (due to weight restrictions and balancing).