Hoppers are very useful for Redstone as you know, but they are currently disabled. Hoppers will help payments system and advanced farmings. -Ex: Skin comp payments can be stolen by others and clear lagged. Create an automatic farm. Extended trade shop. Redstone.
support. Hoppers are more effective than simply using a river of water to collect and move items. plus, kinda difficult to have an auto-mob grinder without them...
There are issue with hoppers, like duping items. I think after they fix this patch up, It should be back
Support. We need to make sure that people can't dupe tho! Get Aimee or Rellur to test them. (I'm joking)
I will forgive you as you are a new user but please read the current suggestion threads and discussions before creating a new thread. There is a reason they are disabled and a user who had notified the admin of a fix. Now it is just a matter of waiting.