Ahhhh, just a few general points:
1) Reverse loops are easy enough to wire, etc, but if you're lazy like I am, why bother? Keep things as simple as possible to save time on maintenance, $$$, etc. I have only X dollars to spend on hobbies, so I look for savings. I would like a working signal system someday though. LOL!
2) It's often a good idea to have a switch lead / drill track / etc, so you can switch a yard without fouling the main. But there are plenty of proto yards on lower traffic lines that do indeed foul the main when switching.
3) Always consider how far you have to reach to rerail cars, manually throw switches, vacuum dust of the scenery, etc.
4) I dislike reaching over buildings, cars, etc - too easy to knock stuff down / over.
JMO and one size certainly does NOT fit all in this hobby. Good luck!