Yes, all of the time. I find myself using the 'edit' button often. I've hit 'edit' multiple times on the same answer too. That nifty button is a life saver. Especially, with all the grammar nazi's out there.
I wish that when you ask a question you could edit the question. There's been a few times where I made mistakes and couldn't find away to correct them. I wish they would add that feature. I feel like it impacts whether or not someone will answer. I've since been paying more attention before submitting it.