I'd agree with that. I jg, and usually if I see my opponent in a lane, I will look either to counter jungle, counter his gank (if I am close enough and healthy enough to do so), or I will go take an objective in the meantime. If I see another lane is a gank candidate, I'll do that also.
It's especially fun when they're bot... you gank top, get a kill, the tower, and get your Tryndamere his Rift Herald on top of it. At that point I just leave him alone and work the rest of the map.
I will say this, however: anyone's best bet early that isn't a lane bully is to work the minion wave back towards their own tower and just freeze the wave. It doesn't matter what lane you are. If your opponent wants to cs, they will need to leave themselves open to be ganked. Even if they ward, there's more than one way to get around to gank position no matter who your jg is playing. It also protects you from most normal ganks.
Of course, there's still the Olympic 5-man botlane clown fiesta tower dive gank, but that's got more tilt built into that topic than a whole football field of pinball machines.