This is totally a useless thread because none of these things are "unique" anymore. They exist elsewhere even on windows.. My F1 key says HELP on it :-)
The one thing I like about Amiga Workbench (and I hope wanderer gets this hey Aros GUYS!) Is snapshoted ICON positioning and .info files for icons.
I think the most annoying feature I could think of is AppICONS and how they are implemented. The idea is a good one, but no one has used them very effectively.
For those who doubt my post, about Windows doing all this stuff don't make me post a 3 page reply with graphics as proof.. It's such a waste of time here for an Amiga focused forum. We all don't live in 1991 here so please as the previous poster said keep this on point.. I personally would like to see an Classic AmigaOS/AROS extension that allows the CLI to also let us use UNC (UNIVERSAL naming conventions).
Universal Naming Convention Info