Even though the user is trust-worthy (owing to the rep of the user), wouldn't it be nice for the OP to get a notification whenever an edit is made, even trivial?
I too would like to see this implemented. A small edit can still mess up a post, and I would happily trade the "noise" sent to me in exchange for knowing about all the edits on my post. This comment asks about enabling all the notifications manually in the user settings, and I agree. It would be nice to have the option of seeing some or all of the edits made on your posts, like with the "reduced ads" option in our preferences.
In addition to Ollie's answer, I would also like this. As an example, one of my posts which included the word "color" was edited 1 to change the spelling of that one word into "colour". It was only changing one character, and I was notified of it by another user pinging the editor.
I would like to know of edits like these, because they are trivial and I don't like the word "color" to be spelled "colour", at least in my posts.
And sometimes one character can make a difference. For instance, a user with full editing rights could just change the d in duck to an f on a really old post with a lot of answers. Nobody would most likely notice if the author of the post wasn't notified.
Maybe we could have this as a profile setting - so some can opt out of these notifications. I know some people just hate having their inbox full, especially high rep users.
1 - This editor had full editing rights