Thinking of this email and the "lack of time" answers...
Would it make sense to have periodical UX sprints where we would focus on certain item(s) at https://www.mediawiki.org/wiki/User_experience_review_queue
Those sprints would be scheduled ahead and would be planned and promoted as group activities involving the developers of the features reviewed, members of this list and anybody else interested.
A bit in the style of
https://www.mediawiki.org/wiki/QA/Weekly_goals
but starting with one sprint per month.
This could raise the attention (and the fun) around this queue and our design related activities in general.