I generally agree that camping top isn't the best strategy, although that doesn't mean you should never do it. If your bot lane is doing a decent job of playing back and warding and generally being safe from ganks, you don't really need to be there. When your bot lane is getting kills 2v2, it's often best to make sure the rest of the map is staying even/ahead and just let your bot lane get fed on their own. If your mid lane has priority, you don't need to be concerned about the enemy mid roaming on your bot lane for a 4man dive (or 5 with top's tp) and you can generally stay away from that side of the map if the enemy jungler isn't strong at ganking them.
I generally like to gank top a couple times early - take advantage of my early level advantage on an enemy that will get too tanky to kill before long. Try to get my top laner a solid foundation so he can hold is own from level 6 onwards and not see me ever again. I'll look mid whenever it's available because opening them to roam bot helps ease my job. I'll look to gank bot, especially when I have ult and they don't. It really depends on if I'm good in to ganking them though, and where my bot lane is keeping the wave.