Trees! Kill some or "I like containers"
Users. The whole format needs an overhaul. Us old timers have used Microsoft LAN Manager (v1.0-v2.1, pre-AD) and were challenged when the user panels only showed lists of users. No organization other than that there were users. No column control, column sort control, and NO tree structure.
When you are dealing with 1000s of users, this can be a challenge to see quickly (at a glance) users within a container (which there are none).
The structure here should mimic the local AD structure. Instead of "views" (which forces the use of a specific local AD groups), use the local AD container structure.
Also, give some thought to "right-click". Lots of useful config info can be placed there...