For me, its definitely the self filling water bucket hard plumbed into my house water system. Its 4 nipples screwed into a full size 5 gallon food grade bucket, hanging on two shelf brackets, with water supply piped down into the top to a standard toilet fill valve. No more of the daily bucket brigade, I just turn it on and let it go - about once a month I close the shutoff valve and unhook the bucket to dump it out and clean it.
Next to that, I'd say it's my home built 200# capacity bulk feeder.
My only daily chores are the fun ones - gathering eggs, and sharing treats...