Level 2 gankers are going to gank no matter what though, it's not exactly like you can stop them from ganking level 2 for the reasons that lie primarily in their kit. The EXP changes make it so if a gank fails, the jungler is actually punished with the time it took to gank instead of farming. Meanwhile, map aware junglers can use that advantage to take the opposite side jungler's camps, further punishing them.
Folk keep missing the point of the changes. The point wasn't to nerf level 2 gankers, it was to add a price onto ganking that wasn't being paid before. An unsuccessful gank just meant they could whip back into their jungle, and still be the same level and gold as their laner counterparts, who aren't roaming 24/7. That's not even to mention actually getting a successful gank puts you and your laner ahead, and then you get your camps on top of that.
The point of the changes, was to put a price to ganks. Junglers have the unique ability to constantly pace about the map, and influence the game heavily. If a laner could do that, and stay equal in EXP and gold even with a failed roam, there sure as hell would be an outrage.