Labeling shutoff valves is a game changer—makes life so much easier when something goes sideways. I’m with you on not trusting those cheap moisture meters 100%, but they’re better than nothing for a quick check. As for pipe inspections, I’m a bit in the middle. I’ll do a visual check every year or two, especially in basements and crawlspaces, but I don’t call in a plumber unless I spot something off. Feels like overkill otherwise, unless you’ve got really old pipes or constant issues.
I totally get where you’re coming from—calling a plumber every year would wreck my budget. I do the same: just keep an eye out for leaks or corrosion, especially around joints. Ever tried those pipe wrap leak detectors? I’m tempted, but not sure if they’re worth it.