Agreeing with Pterodactyle, you won'd see much if you don't tilt the FD down. Just pulling the boot back doesn't let you see in there an you definitely won't be able to grease anything.
Update on mine for anyone that ends up with the back of the drive shaft stuck to the FD splines: I took it to a local driveline specialist and he got the shaft separated from the splines. No damage to either and after some cleanup an wire-brushing, the shaft, yolks, drive splines, and u-joints all look like new. Had to cut the rubber boot off though in the process of getting the shaft off the FD.
Again, my two cents is that for the 15 minutes it takes to drop the FD and grease the splines, you also get to see inside the swing arm to know if there is any water in there. This is a very simple maintenance procedure.
On a site note: I know on older models, the front of the drive shaft was held onto the clutch output shaft via a circle inside the drive shaft yolk which dropped into a groove in the output shaft. I will look more closely, but I don't think my bike (2015 GS) has a circlip. When I tilted the FD down originally, the front of the shaft came sliding right off the output shaft with no effort. So there either is not a circlip, or mine was not engaged the way it should have been. I will check the front of the shaft tomorrow when I put the bike back together, but if anyone knows if there is/should be a circlip, I'd love to know.