This, but I like projecting too. I shoot slide film because I drop it off, and when it comes back I have slides. They don't need scanned, printed, or color corrected. I don't have to feel guilty about not scanning them or printing them. It's a black box-- exposure in, slides out. For me, color is about snapshots and vacation photos. Slide film does this perfectly for me.
So, my reason for using slide film isn't about projection at all, but about the "feel" of the colors, ease of scanning, and the more accurate rendition.