At UCLA we recently implemented a change to the Activity chooser in which users can choose which items show up. This can drastically reduce the number of elements that show up initially on the Activity chooser, and in many cases the activity chooser can fit on a single page.
We also removed the categorization between activities and resources, since the distinction is lost on our faculty.
See the video to see the feature in action.
Tracker issue: https://tracker.moodle.org/browse/MDL-57828
What do you guys think? Also, vote on the issue in the tracker if you want to see it in the next version of Moodle.