I think it's a good idea to activate the ABS on both wheels just to see what it feels like. If nothing else you won't freak out when it kicks in when you're driving. Try it on dirt or gravel where it kicks in pretty easy. You can make it work going pretty slow on loose dirt or gravel, then speed up a bit and try it again.
There's been a video posted around here a few times that shows a rider stopping on dirt with and without the ABS turned on. It shows rather dramatically how much longer it takes to stop on dirt with ABS. By all means I would turn off the ABS on dirt and gravel.
The urge to buy terrorizes.