The "Recent Questions" list is useless every time "Bill the Lizard" goes on one of his editing sprees. Editing (and closing) questions should not bump them onto the "recent" list.
I could argue that editing could be more of a reason to bump.
New posts have plenty of visibility. People evaluate, respond, and vote on new posts so they are thoroughly vetted by the community. Not so with older posts. Someone could easily change the context of a question to render everyone's answers incorrect. Or they could just be adding spam.
You don't want content added to your system without people noticing. Bumping edited posts is the primary way to assure that new content is visible to the community.
UPDATE: If something like this could be implemented (Make Activity Description in ‘Activity’ Tab More Descriptive), at least you would know whether to bother looking at the recent "activity."