I hadn't intended to criticize you, Fred, just offering another opinion!
Hi Mike, I did not feel any criticism in your post, on the contrary
In fact, I tend to use more and more little previews to check my own works.
I remember in painting, while in the studio, I physicaly took some meters distance when I wanted to check the overall image
into the working process.
I always found that the zoom tool did not give exactly what I wanted. So recently, I implemented an html system with
a switcher. I send a pic to a server in intranet and automatically rezised to 500px max width.
Then, I use the switcher to change the background color, grey, white or black and check the colors.
As I work with large formats, this helps me a lot to get an better idea.