Charley Talley, inventor of StarSan, has said that good sanitation is 90% cleaning. If you clean well enough, you may not need a sanitizer. Using a chemical sanitizer is like an insurance policy on your cleaning.
Personally, I'm more worried about whats floating around in the air than I am about whats on my equipment.
I do...clean all bottles, fermenters, tubes, buckets, chiller, etc. before putting them away. I don't scrub the hell out of them, I just clean them, like dishes. I clean them again, quickly, before I'm about to use them, and use starsan just before use. I wash my hands and try not to sneeze all over everything. I turn off the ceiling fan and AC when cooling wort or bottling inside.
I do not...bake my bottles sterile, store my fermenters and tubes filled with sanitizer, or store things in sealed air tight containers. I don't even boil water for rehydrating yeast...but I think I'm going to start
Common sense is the rule. Make sure the things that need to be clean are clean when they need to be, and don't worry about the rest of it.