One way is just to review your project list, and then jot down the key projects you'd like to update your Boss on - as an "agenda" list for that boss. If you have a regular check-in, you can literally take 2 minutes beforehand and jot down the projects. This would obviate the need for "inappropriate disclosure"!
I realize you don't want a separate "status sheet," but it really could be just a back of the envelope thing, don't you think? Just a few notes to give the highlights - it wouldn't have to be a really formal report. And if you were to proactively seek out your boss and offer to give them such an update, I would think Brownie points would be in order...!