only work in code / design?

I work strictly in code view.  Matter of fact, I forget where I found the instructions, but I have basically disabled design view because I work in server-side scripting and design view does not work well with server-side (at least it doesn't on older versions of Dw.  Don't know/care if later versions do.)

Also, I am very anal-retentive (borderline OCD) and have a need to see code in order to do my job.

V/r,

^ _ ^

either if I often use an external code editor for more substantial tasks, I most of the time use split view (code / design) just because it's easiest to edit text content in design view than handling it in a code editor...

editing basic code formatting using design view is something pretty nice

visually navigating into large file is also easiest in design view than in code view...

finaly, I never, or very rarely use live view, just because a watching script reload file in different browser more smouthly (at least fo me)... thanks node

last point talking about CS6

The main reason I can think of, to work from a non-split window, would be screen real estate.

On a laptop, I work solely in Code View. On my desktop, I am generally in Split with Code and Live. I rarely ever touch Design View these days.

I suppose it's technically possible to use Design View only, but you'd constantly be surprised by your results when previewing in browsers.

Why not?

If a coder only has Dw, (for whatever reason) then code view is the better option.

As for design view, it is now nothing more than a legacy feature, but many users with limited coding skills prefer it to live view, (which can cause sever performance issues.