Months ago, I estimated a feature to take 3 weeks to build. A couple of months later, deadline nearing, a new developer was asked how much time it would cost to build and they told the product owner that it would take about 3 weeks. The product owner then looked at me, annoyed, telling me that nobody ever told them that it would take that long to build. I was really happy that I could show them the initial estimate I gave them.

If you haven't experienced this ever, definitely be extremely grateful. Also, when you switch jobs, beware that past experiences are no guarantees.