I just discovered a, possibly optimal, solution to this mess. There is as service called "cups-browsed" which apparently is responsible for going out on the network and finding all the printers it can locate and install them for you (gee - thanks --NOT). Since this is an Upstart/Systemd job, you can stop the service with:

For Ubuntu versions 15.04+ (using systemd)

sudo systemctl stop cups-browsed

Followed by:

sudo systemctl disable cups-browsed

You may still start/stop the service manually if you wish with:

sudo systemctl start cups-browsed

sudo systemctl stop cups-browsed

For Ubuntu versions prior to 15.04 (using upstart)

sudo service cups-browsed stop

Even better, you can prevent the service from ever starting again by adding a simple text file to /etc/init that contains the single word manual. The file must be named
cups-browsed.override

So, just start up gedit with

gksudo gedit /etc/init/cups-browsed.override

put manual in the first and only line and save the file.

On the next Reboot, the service will not be re-started. However, you need not reboot if you've already stopped the service. Once you've placed this file in /etc/init, the service can only be started manually (if and when you need/want it) using:

sudo service cups-browsed start

-or-

sudo service cups-browsed stop`

I have tested this over one reboot. Printing still works fine and so far I am not getting several hundred printers installed anymore after the reboot. Just the ones I installed manually show up.