Wait times will definitely be long during Star Wars weekends. While I've never been to Star Wars weekends, my understanding is that the crowds at Star Tours is reasonable all things considered. Having said that this year should be different. It's a new experience and the masses that are going to Star Wars weekend have never seen it.
I don't expect Potterland type crowds for Star Tours or Star Wars weekend, but I wouldn't be surprised to see it have the longest line in the parks - at least for the Star Wars weekend crowd.