I'm partial to Plant Growth (dru3). Using the Overgrowth function, suddenly enemies have a move of either 5 or 10 feet, over a 100ft radius circle or a few other shapes. You have over a 400ft range on the spell, too. There's no save, so I find it pretty reliable against melee-based monsters who lack flight, etc. I think it's at least good for its level, even if it does lose use over time.
You just need to have some brush and a couple of trees.
More effective from a Druid or Ranger, as they both have Woodland Stride by the time it is available to them. They move around unhindered.