I have written a vim plugin (ikiwiki-nav) that enables you to "follow" the wikilinks in an IkiWiki page, from inside vim; the plugin does the following:

• extract the wikilink of the text under the cursor
• figure out which is the file associated with the wikilink
• open that file (if it exists) in vim

It also has a couple of mappings for jumping to the previous/next wikilink in the current file.

ikiwiki-nav can be found here. You can find the usage and installation instructions there too.

It has a git repo, which you can find here.