When was the last time mounts/mounted combat saw a use?

[PieAndDragon]

Pretty much every week. In one campaign we've got a goblin who rides a dog or monkey and a ranger who rides a giant wasp / whatever creature he uses as a companion that week. Their opponents often ride mounts as well, with the relevant feats.

In our other campaign we have a warforged druid on a dire boar. Ridden in pretty much every combat.