I'm searching the the least expensive way to travel to watch my daughter cheer in the parade in November but I also want to stay on the property because I keep reading about how awful the shuttles are at the off-site hotels. I found what looks to be a great deal at Pop Century on Trivago. My question is, if I book through Trivago, will I be eligible for the Magical Express? Also, are there any drawbacks to using a third party?