What I like to do, is to solder everything on circuit boards, and any connections that will be permanent or semi-permanent. I like having wires that are spliced onto other wires covered with heat-shrink tubing instead of being wrapped with tape. And termimal strips or connectors are soldered as well.

If I'm using a spade lug or other crimp connector, I like to solder those too. Stranded wires that will be inserted bare into spring-loaded connectors are tinned with solder. For serviceability, I'll employ spade lugs, jacks, plugs and other types of connectors, but I like having them connected to their wiring harnesses with soldered connections. That way I am able to have cable assemblies that are removable and keep the equipment they're used in serviceable, but I still get a good connection that is mechanically and electrically sound.