I look for the video the day after the attraction/land opens, to get a preview for my next visit and to satisfy my curiosity. This does not spoil it for me when I finally visit and experience the new attraction/land, because, and I've made this comment multiple times on here when people start bashing a new addition only based on a video, you cannot get the full experience through YouTube-only when you are there and experiencing it in person can you get that. We will be taking our 15 year old neice for her first trip to WDW in November, and I have offered to show her some WDW walkthroughs and attraction videos on YouTube, but she says that she wants to be surprised. I applaud her for her dedication-she's a better person than me in that regard.