Shot my first wedding 18 months ago primarily with a 28-135 IS on a 20D. Indoors it was a struggle at times to get far enough back. But the biggest problems with this lens are it gets to f5.6 quite early in the zoom range, and it tends to be soft at the 135mm end. The IS is handy, of course, but we replaced the lens before we did our second wedding (bought a 17-55 IS and a 24-105 IS).
I think 17-55 is plenty wide enough on a crop camera - the 17-55 and 70-200 ranges are a great combination for a wedding. Yeah you can always find uses for wider, but, unless you're going for dramatic perspectives, they're a small percentage of shots.