Its definitely worth the $$ and the wait in line... if you're going to go during the day (don't bother) I mean its pretty and all but at night its breathtaking. I have some amazing shots that i took from up there a few years ago of the strip and the Bellagio fountains... its really amazing when you can almost stop time.
While you're at the Paris you might as well get a really expensive drink in an Eiffel tower or a Hot Air Balloon... its just all good drunkeness...