I still don't understand the popularity of that ride however you are correct it is definitely going to do wonders for capacity. If I go back after the ride re opens I may re ride it as I would like to see what a difference the new projectors make.
Soarin' appeals to those who aren't into coasters and big flat rides, but still want a mild thrill. It particularly appeals to senior citizens (my parents loved it at DCA) and kids.
I like it, myself, because it's a very relaxing ride; but I wouldn't wait for hours in line to ride it.