I shoot weddings with film. The two main reasons are that I'm not ready to buy a second DSLR (gotta have a backup) and the exposure latitude is much narrower.

Far as the exposure latitude goes, the advantage doesn't have anything to do with exposure inaccuracy. Underexpose neg film and you've got a grainy mess. If you're outside in harsh light (or using direct flash), think about the contrast of the scene when you're shooting the bride and groom. The bride is in a bright white dress, probably with a sheen to it and a lot of detail. The groom is in a very black tux. That can be too much for neg film to handle, much less digital. It's too easy for the highlights (and all of that detail in the bride's dress) to get blown out.

Also, like Paul says, digital and flash aren't as foolproof as 35mm SLR's with TTL metering. It will take awhile to get the hang of it - I'm getting my best results with the DSLR and flash with the flash in "A" mode (like what's been used for years in flashes like the Vivitar 283). Now, if the flash is less accurate but the overall exposure has to be more accurate... Then of course throw in a healthy dose of stress on the day of the shoot too!

I'm sure I'll be using digital for weddings before too long and hopefully by the time I do the cameras and flashes will get even better. I'm planning to use my Fuji S2 a little for some I have coming up next year - but only in certain situations. The new Fuji S3 has a more exposure latitude, and the newer Nikons have a much-improved digital TTL flash system. But it's not there yet...