Saw it last night too -- took lots of photos -- I have no idea how to post them here...This is a link to all of my CP 2009 photos so far, which includes photos from the Starlight Experience...
http://ronannarbor.smugmug.com/gallery/ ... 0321_gq756
My thoughts? It started way too late -- CP's idea of opening at "dusk" was 9:15 pm...it took them a long time to set up, I was standing right in front of the MF tunnel, and there was lots of grumbling from people trying to get from Millenium Force to Maverick and vice versa when they weren't allowed to pass through the Trail for a half hour. The security guards at the MF tunnel were having trouble holding people back -- they had half the tunnel chained off, the other half open from the many people passing through the other way. Eventually, they got tired of the harassing they were getting from the teens who wanted to pass through and resorted to lines like "Take it up with management, not me" and "Go around, there's nothing I can do about it, I just work here"...
It will definately change the "tour plan" for people incorporating MF or Maverick late at night -- you'll have to take the train from one to the other.
For those who don't want to brave the crowds and walk after they have been walking all over the park all day and just want to go home, can ride the train -- you will see 80 percent of the lights from the train between Frontiertown and the Midway (Note: you can only see them on the return trip, not the trip TO Frontiertown). You can see the floats that they use for the Peanuts characters from the train under MF in the storage area on the way to Frontiertown.
The lights are pretty. It's worth a walk through, but I'm not sure once you've seen it you are going to go out of your way to go see it again on a return visit. It's pretty similar to the types of displays you see at zoos across America at Christmas time. I did like that the lights were themed to the different seasonal holidays (blue and white for winter; orange for fall; Green and Purple for spring, etc...)
My overall reaction -- it's pretty. I've seen it, don't need to see it again...and more importantly, they need to find a way to set it up in less than 10 minutes, not 30 minutes; and they need to start it a good hour earlier at the same time all the other park lights come up.