I'm a WikiOgre: I spend long periods of time looking for articles to edit then make a lot of contributions in a short period of time. I mainly perform cleanup and copy-edit, but I see the value of WikiLove and collaboration, which I'd like to become more involved with in the future.
My main interest is in miscellaneous cleanup around the encyclopedia. I copy-edit for grammar, clarity and brevity, adjust links to ensure that the transition between related articles is as smooth and topically heirarchical as possible, add hatnotes and templates and post messages on the talk pages of obscure articles listing what I'm too lazy to do.
Efforts to organise the encyclopedia into a more productive and comfortable place for its editors are more important now than ever. Productivity-wise, the Task Center, Dashboard, open task list and maintenance resource list are evergreen sources of articles that require correction. Articles for Improvement might be the best, though. I think that more articles should have to-do lists.