BBEdit is one of the few apps I miss from the Mac world. ResEdit/Resourcerer are up there as well, being able to naively open up the resource fork and customize applications and sometimes make massive changes to them was great fun.
Truly it was a different world. I learned so much investigating and modifying resource forks!
But maybe I just did not see a need for applications beyond the ones I could already get so saw no need to learn to write applications from scratch or was more interested in exploring. Too long ago to remember my motives.