Maybe it's my undying love of weird utility spells, or maybe it's the Planescape: Torment fan in me talking, but I can actually think of quite a few scenarios in which Feign Death would actually be a worthwhile spell to cast. It's as niche as it always was, but is it useless? Hardly.
Most of the ways I would want to use Feign Death would require a longer duration than one hour.
I find that once someone is convinced a creature is dead they tend not to keep checking.