I posted this a while back, just shows a few of the issues I personally have.
So in action cam there is no more:
- Point and click with mouse to attack
- Point and click with mouse to move
- Point and click with mouse to loot
- Auto-attack
- Hold 2 mouse buttons to move
- Select multiple party members with mouse, either by click and drag, or by selecting multiple portraits with 'Shift'
- Walk
And we could do this in Origins specifically for the tactical camera...- WASD movement of controlled character
- Navigate camera by mouse touching the edge of the screen
- Tilt camera to also see from below, "worm's eye view"
- Zoom out for a tactical view
Can I cry now? 
Ok, so UI and controls get lumped in the same category? Like I said, I understood the issues with controls (even if I don't care about em myself). For what it's worth, my interpretation of UI was strictly things like the abilities bar, the party member icons, the menu buttons and such.
I do miss some of the things you mentioned, I just really don't dwell on that kind of thing, I adapt and move on.
EDIT: Err, you can still use zoom out to bring out the tactical camera though.
Edit: I've got a few more we've lost:
- Detailed tooltips when the mouse cursor hovers over an ability.
- Option to hide the minimap
- Option to decide how many ability/potion/command slots we have on the quickbar, it was our quickbar.
Ah ok, this are some I hadn't even noticed were missing cuz I never really made use of them myself.
I do miss being able to hide the entire UI comfortably for screenshots, that I will cry about tbh.