AITA for not telling my coworker [4 years] about utilities/programs I have been using to complete certain tasks?

Was hired for a job 4 years ago. I was the first specific hire for the company in my specialized position. Before being hired, the company was relying on someone who fell into the position with no training-there was a lot they did not know.

I started revamping processes and instituting best practices. I also brought along a lot of industry specific utilities and software that helped me in my day-to-day. Some of these programs I had to get white listed and some were stand alone programs that could operate without being installed.

Certain jobs would come up that required some of my utilities. I would take them without explaining how I was completing the tasks. In this way I was able to retain complete control over these tasks-which translated into a lot of overtime.

Today I was able to drop in 3 hours of overtime using these unknown utilities. I came off as a magician in being able to complete the work. My coworker has no clue still that there is software out there that cuts right through these tasks.

AITA for not revealing these programs to my coworker?