Despite having years of software experience under my belt knowing that things always take longer than expected, I remain surprised at how much longer it takes to get things done in bitcoin due to (a) being a protocol (b) being more decentralized than anything else. Having patience for that is the hard part.

My favorite part though is still how much progress so many people can make by building on top of the protocols. It is satisfying to see how much more usable bitcoin is today than 6 years ago, and I cannot wait to see what it looks like 6 years from now.