I think its more just the different building codes and where you are at and what the electrical contractor can do or is trained to do and what is approved or not approved.
In the midwest house there are GFI's in every bathroom, kitchen, garage et al; even on all of the outside outlets. I have metal conduit and gang boxes here. There are neutrals in every box and many of the switches are configured as three way. The hallways on the first floor and second floor have something like 4 switches just for the hallways. On the second floor its nice because there is one outside of every bedroom. Just guessing it was a master electrician or an "obi wan" electrician that did the electric. In the last few years I've pulled more wire for more circuits and have done some granular circuit stuff filling out my panel.
In Florida the electric done with romex was totally different. I didn't really pay much attention and probably should have. Box to box there are neutrals; but the boxes are a bit shallow for me. That said though all of the kitchen outlets connect to one GFI in a bathroom away and in a different part of the house. Makes me wonder as the GFI's are a bit larger but these days are relatively inexpensive.
Yeah here in the midwest it was time consuming to check the electric; not so much the hot (black) and neutral (white) and ground (green) leads but rather the colors utilized for the travelers which are blue, yellow, red (?), et al. I did sort of document and clean up the fuse panel such that the circuits were documented a bit. It was low on the WAF; we used walkie talkies.