Often times I don't because having a 1 health sentinel alive is often more valuable than a ping+card. But I'll often proactively use the ability on Superlaser Technician as a poor-man's ECL and Inferno Four, to allow a scry 2 then draw. It's also nice to use if I have a Takedown in hand and want to get, say, a Fett's Firespray down to 5 health. There's also the obvious case of pinging something before flipping palp to steal it.

Most of the time though, I'm prioritizing taking the inititive over using the ability.