Those first green flashes out of your USB ASIC are an amazing feeling, yeah.
I only started mining a couple of weeks ago, and already I've repurposed a Raspberry Pi into a MinePeon box, with my USB miner plugged in so it can crank out tiny fractions of a BTC 24 hours a day. Mining makes for an addictive pursuit, and you'll lose more of your time to it before you're done

I just sit and watch it flashing every now and then, for a couple of minutes. Of course, the flashes are getting more infrequent now: eventually, I'll go for a full minute without seeing activity. Then I might burn some more fiat on another miner or two, just to get the "flashing light rate" up again.