- Spot is a detection skill that allows you to know who is there
- Spot counters feint
- Spot counters disguise
- Listen allows you to detect sneakers without letting you know who they are (unless metagaming)
- That's it !
Hide is still easier to pump than move silently (mainly thanks to camouflage spell) so listen arguably remains the best detection skill, but not by much anymore, especially since you don't know who is around. At this point it seems to me that you can just go for spot and forget listen if you have the choice.
Leaving the detection part as it is... shouldn't listen get some love and be used for other purposes than detection ?