Wow, a kindred spirit! I personally loathe editing long-dead questions, especially when the changes are minor. They push new questions off the front page for no good reason.
But that is not a universal belief: a great many people on Stack Exchange believe that any edit, no matter how small, is a good edit. That if you see a post that can be improved, you should do it without any regard for how it affects other posts on the site.
And there's a practical reason to edit: we're in the midst of a cleanup of bad tags that are causing problems for new questions. The only way we can get people to stop using those tags is to remove them from all previous questions. And to do that, we need to edit them.
Ideally, the front page should be a mixture of brand new questions, active questions that have not been solved yet, and old questions that have been improved. Having too much of any of those makes for a front page that looks more dead or artificial than alive and bustling.