This is an interesting point... I think it matters - possibly for a different reason. If you imagine from the ground: a terrorist car bomb VS a drone strike, they're virtually indistinguishable. Both are explosions without warning by the 'enemy.' It's almost a joke that people condemn terrorist acts and respond in kind.
That is exactly what they are doing. Terrorism is all about relatively minor, cheap, covert strikes against somebody perceived as the enemy.
The USA wont kill everyone that opposes them with such a campaign, but the point is the same as "terrorism", to send a message of fear if you dare oppose us, or associate with people who oppose us, damn the "collateral damage".
Make no bones about it, this is exactly the same kind of asymmetrical warfare that the USA itself condemns as terrorism.
I mean, yeah, that's what we're told. But the fact remains - drone strikes create terror. And on the other side, believing terrorist acts are simply to create terror is naive.