If you have a lot of repeating geometry like that that you want to truly spline, the duplicator wizard will simplify the creation of it.
1)model one post sticking from a flat surface but leave off two sides of the basic "square"
2) select it and use the duplicator wizard to make copies of it in one direction and then attach the free hanging cps that are meeting each other.
3) delete those joined CPs
4) use the dupe wiz again to copy the whole thing in the other axis direction
5) attach and delete the remaining free hanging CPs
6) you still have to turn on all the five-point patches. ( I didn't say it was fast, just easy. )
Even if your object had these details in a non-regular grid arrangement, you could use this technique to get the mesh done, then slide parts around into their intended positions.