i think people need to define "re-use"

receiving funds repeatedly from many people to your one address is no harm at all.. (from a brute force hack prospective)
.. its the repeat spending that has a slight miniscule(brute force hack) risk.. but still negligable*

the privacy risk of receiving funds from multiple sources to one address or spending from one address to multiple people is where each merchant/sender/receiver to or from that address, where if you offer personal info then associates that address with a name they have. and they can then pass that info on if you keep using that address if it becomes an interesting address to keep an eye on

*however the risk of someone brute forcing.. well as i said in my last post.. give it a try. try brute forcing satoshis address from his block9 reward , see how easy it really is