I think its a very nice feature and it gives me, as a server and IT administrator, an additional level of security. It can be slightly annoying right now with 10.11, because many tools insist to be installed in /bin and other system-only parts of the tree, but that is hardly the fault of OS X. So far I see no reason to disable it. Only had to reinstall some stuff to /usr/local, where it should have been from the start.