Quickest way is to re-select the patch.  For instance, say you're on Bank 1 Patch A, you add an EQ in and decide you don't like it, simply stomp on switch A again, and you're back to the saved patch. 

I actually use that when playing live sometimes, as I have "tails" turned on, so if I turn a delay on and then off, the trail of the echo will remain. But, instead, if I re-select the patch, it goes quiet instantly.