One of the most important things that has been missing in mediawiki since its inception is a way to organize one's work and decide what to tackle on next. It may be a good idea to draw inspiration from similar systems such as wikihow's task list, Extension:CollaborationKit and wikia's public dev:special:community as well as its private admin-only Special:GoToInterwiki/wikia:c:Help:admin_Dashboard .
The latter in particular is a pretty good model to follow as it basically serves as a tool to help users familiarize themselves with wiki tools, and it also helps guide the administrators to make a wiki successful (in wikia's terms). Although some of the tasks therein apply only to admins, others are helpful to just about any contributor. In a perfect world, both a private and a public dashboard would be available as that creates a sense of collaboration.
Currently wiki users must use awful hacks such as creating lists of pages in the user namespace, risking vandalism, reverts, and people belittling their tasks. The creative process is certainly most effective when it is made in private without any interference.
Also this feature is basically the request in https://phabricator.wikimedia.org/T91655.