Thanks for the reply... :)
spreading out Widget management over several pages would be terrible UX
I definitely disagree with that one!
I would argue that having a few widget menu pages is much preferable to having (for example) the following widget areas on one page:
Front page widget area 1 (This is not what they would be named, of course)...
Front page widget area 2
Front page widget area 3
Front page widget area 4
Front page widget area 5
Front page widget area 6
Front page widget area 7
Post page widget area 1
Post page widget area 2
Post page widget area 3
Post page widget area 4
Post page widget area 5
Post page widget area 6
Post page widget area 7
Content page widget area 1
Content page widget area 2
Content page widget area 3
Content page widget area 4
Content page widget area 5
Content page widget area 6
Content page widget area 7
Trying to drag widgets into the widget areas becomes impossible... That is definitely not good UX.
(And yes, in case you were wondering, I have very good reasons for wanting such a large number of widgets in my theme).