My first programs ran on a programmable calculator. I wish I could have kept the habits I had back then. Drawing block schemata on paper before coding seemed tedious but it was in fact valuable. Damn you lord Sinclair and your ZX Spectrum for providing a full screen "editor" which let me skip the design phase. And it didn't really have cut'n'paste in the modern sense.
I'm not sure the original ZX Spectrum editor qualifies as "full screen" as selecting a line and visually editing that line are separate tasks. It has more in common with RegEdit than with Notepad.
(Edited) Also: http://clonedigger.sourceforge.net/ Use it for great good.