In terms of shell aliases and helper functions, I actually go out of my way to not allow myself any.

As a young person, I was on a trip to visit another ISP to learn how a VPN would work between our two companies. Their administrator, a wonderful person with 30 years of experience in the telco-turned-ISP world, had all these incredible aliases on her workstation for managing her fleet. But on the new vendor's system, a fresh install of the same OS left her almost unable to perform.

My jobs have all had the same opportunity for the same experience, and I've tried to leave it alone. I spend maybe 2/3 of my time logged into someone else's server, and I don't doubt myself, even knowing fully well it's a personal preference above all.