The first company I worked for claimed that most new employees took 6 months to ramp up to the internal tools & processes, which sounded absurd to me until I actually started ramping up myself. Holy cow. And the people who were entrenched in this company's particular way of doing things seemed like absolute geniuses until I realized how much of their knowledge came from years and years of doing the same things over and over.
I think the best way to combat this is to recognize that tools, techniques, processes, and technologies are all an inherent part of your product and your business. Much like you take the time to refactor code and combat technical debt, I think it's pretty crucial to also devote time to combating "process-debt" and/or "tooling-debt" -- all of that extra cruft that piles up and starts becoming "the way" to do things at your company. Because, just like with code, there is usually a simpler, more practical and/or elegant solution just waiting to be discovered.