I remember when there was an option here - a checkbox - saying "minor revision". Such revision would not be visible in revisions history (I think).
Now, I don't particulary miss that feature, however here and there I come across a situation where I'll edit a post because it contains private data (e-mails, usernames, passwords even ...).
In such cases, wouldn't it be wise to allow people with 2000+ reputation with the right to directly edit a post to mark such edit as "hidden", so people won't be able to see previous private credentials anymore in history?
I hope I understand it right that reviews history is visible to anyone?