User blog comment:DaNASCAT/Technical Update: April 4, 2011/@comment-3080486-20110409054730/@comment-1656630-20110411183705

Wiki Activity is intentionally different from Recent Changes -- it's meant to be the friendlier, less technical version for people who just want a general idea of what changed most recently (especially for new users and people who aren't as familiar with wiki conventions).

If you want faster access to Recent Changes, I recommend just adding it to your toolbar.