The longer I'm in technology, the more I realize that there's a lot of value in just having been in the industry for a while and paying attention to what's going on. This is particularly relevant in troubleshooting. So much of being able to diagnose a problem quickly is just a result of having diagnosed a LOT of them before. Our brains are optimized for pattern matching, which is perfect for this - you start looking at something and go "You know, I've seen something like this before, where the server lost connectivity intermittently. I should look and see if the network drivers are out of date. Yep, that's the problem."