I don't agree. Check in early, give the bags to baggage except for a day bag. Head to the spa or pools,
enjoy the ambiance of the resort by taking in a meal,
hang out at the pool bar,
Monorail rides (one or both loops),
boat rides (from GF to MK, MK to WL or MK to Poly),
Enjoy and explore the resort and all its amenities
When they call you that your room is ready, go there and check it out open up the balcony to your lake view (you did get a lake view for just one night, right? )
Chill out some more, call room service for dinner and enjoy the light show on the lake and the fireworks at MK either at the balcony or beach
the list goes on. The question for me would be if I have enough time to do everything I would like to at the resort