Grease is one of the most useful low level spells I know of, even if I rarely find the occaison to use it.
I remember when I was running a bard through a 3.5 campaign, and we had to cross from one massive stone pillar to another for one reason, or another. Keep in mind, these were the sort of natural pillars that are about 40 feet wide, and 150 feet tall.
I just happened to have some really nice rope on me, so I tied a length to it and whipped out my trusty longbow, scoring a solid hit on the face that raised off of the neighboring platform. The DM saw where I was going with this and ruled that it was deeply buried enough to hold my weight. I proceeded to tied the rope around a sturdy rock formation on our side, and then pull out my lute to cast a quick
grease spell on the length spanning the gorge beneath us.
All that was left was to destring my bow, swing it over the rope, hold on tight, and kick myself off the side of the pillar. I scored some ridiculous roll on the reflex save to keep straight and steady on the rope, and glided across while my companions watched me go with curious looks on their faces.
Another of my friends, the scion of the group, decided to take advantage of this, too. Only he had more of a flare for dramatics. He decided to try to
skate across, hehe. The save was pretty tough, I recall, but he made it somehow. I'm pretty sure the DM gave us leeway for creativity, and made sure that everyone else used more "orthodox" methods of crossing via the rope, hehe.