I actually had a character who used the 10' pole to great effect in our Planescape game. Of course, it was more than just your stock 10' pole.
I had 2 10' poles cut into 1' sections that could be screwed together. In addition, I had several additional pieces that could be screwed onto the ends of the segments (T-junctions, 45 degree angle junctions, 90 degree angle junctions, a hammer head, a spade head, a globe with continual light cast on it, mirror).
This was probably the single most useful piece of equipment the party had (well, aside from the Aasimar Paladin's two-handed sword, the immovable rods, and the ring gate . . . .). I'd attach the mirror to an angle junction and use it to peek around corners and check out rooms before we entered. I could build a ladder if we needed one to reach a high space. We never had a problem crossing 10' pits (20' pits were a bit tricky, but that's life). We were never short a hammer or a shovel.
Anytime we found ourselves without a critical piece of equipment, I'd jot it down and see if we couldn't get the requisite piece made for the pole. Of course, as we leveled up and our spellcasters became more versatile, we used the pole less and less frequently. Still, I'm rather fond of my old 10' pole.
--G