I loved old ignore where you couldn't see they posted or even a quote about them.
We had this???
Why is this not still around!
It was a hack I cobbled together (and "ignore" itself was a third-party modification in SMF 1.1, not a native feature), and you could tell a post was missing because of the alternating color scheme of the post backgrounds.
I've briefly looked at doing this again but I just haven't had the time or motivation. It seems sort of pointless with the quote issue looming anyway. Besides, why would you click on "show post" if you wanted to ignore the person?
The problem is that some other poster will quote the ignored and then you're reading more garbage
This is a legitimate gripe, but last I checked all major BBS softwares suffered from this problem. Only easy solution I know of would be to disable quote tags altogether, and that still doesn't stop people from quoting the old-fashioned way.