A FOP Cast Member told us that he found that the best strategy is to get in line just before park closing. In his words, "If you are going to wait in line, it's best at night and when everything else is closed and you aren't missing out on anything". Personally, I'd take a end of the night FOP line over an end of the night resort bus line any day. Going back to the resort well after park closing might actually make your bus ride back to the resort a lot less crowded.