It occurs to me that that page is what needs to be the front page. Having the set indexes is a holdover from the database, in which it makes sense that that is the first content you see, but that doesn't hold here.
Also, and I don't know if doku-wiki comes with this or not, how feasible would it be to put a section on the front page that shows, say, the last ten or so changes made to the wiki? wikia websites have that and it's a great jump-in point when you don't know what else to look at.