Well - I happen to have a 2-post hydraulic lift . . . and I'm way too lazy to lay on the ground and grease anything . . . so I always put my cars up on the lift. This gives me a chance to see where the grease is going, makes it easy to wipe off the excess and also to inspect everything on the chassis.
Now that I'm 60, the thought of ever laying on a "creeper" again - makes me ill.