It'd be nice to be able to have a link (or maybe even inclusion of a small collapsed list) of a user's own edits to a page when editing a page. Maybe a link from the edit screen that reads "show me my edits to this page" or something?
When editing many articles over many years, it can be difficult to know which articles you've previously touched. Sometimes you can make the same change to an article twice, not knowing that you had previously been reverted, for example. If you can see which changes you've made previously somehow, you can reduce the likelihood of duplicate effort.