When I first started using Photoshop, I did the same thing Ed. Then, I started multiplying my "bad habit" by creating periodic copies of the
Background copy layer so I could easily "fall back" a couple hours if needed. As I moved forward,
PS would get slower and slower and slower. Big surprise.
That habit was easy to break once I discovered the power of Layer Masks and painting, cloning, etc. on separate layers!
Don't know if this was necessarily a "bad habit." Probably more like "I didn't know any better."
- - - - - -
Confession II:
As an "accidental artist" I'd often be experimenting away... applying and/or fading and/or undoing this filter or that, or stepping through blend modes to see what worked (and mostly didn't). I'd apply 2-3-4 filters on one layer... then I'd duplicate this layer or that, try various blend modes and once I reached Oz, I'll pull the trigger on that flatten image command and be done with it.
Once in awhile I'd actually come up with something I liked, but when I wanted to duplicate the effect an hour, a week, a month later on a different image, I was then faced with the question, "How the heck did I
DO that?" I've got a pretty good memory with one problem.
It's real short.
I'm more diligent now. As I work on a layer I assign (as part of the layer name) a letter ID plus what effect was applied and applicable setting values, e.g.,
Layer name: A=USM,200,4,0
(Unsharp Mask, amount=200, radius=4, levels=0)
Layer name: B=Desat A+Median,3
(indicating layer A was duplicated, desaturated and a Median filter, radius 3 was applied.)
These days when I occasionally stumble on a favorable outcome at least I have a decent chance of reproducing the (so-called) effect on another image.
As my dad used to say,
"Some people live and learn. Others just live."