When modifying a post, you are forced to go to a new page to modifying that post. I don't see any reason why you should need to leave the page you are currently on.
Maybe you're right, I can only base it on how I find it at the moment and for me I can edit quicker here than I can using quick edit on a vBulletin forum.
You know, until you mentioned it, I wasn't aware that attempting to edit a post would force you into going onto a follow-up page. Ideally, I would very much prefer to be able to edit my posts "on the fly" and reduce the number of necessary page loads, if possible.
I guess vB have such feature and yeah , it's better to have a quick edit and from quick edit an ability to switch to the full edit.
Lets say i've forgotten to type period or comma , a quick way to edit that would be great .