By default, DokuWiki doesn't interpret single line breaks. I find this quite irritating. So, I replaced the renderer so you don't have to type \\ to force a line break.
The good news is... you don't have to type \\ to force a line break.
The bad news is... if you already typed a bunch of \\'s you'll have double line breaks now.
Sorry for the confusion -- I thought it would be best to force this now versus later.
I can also run a script to remove all the \\'s so far, so let me know if that would be best.