As covoxer says, using templates enables you to set different default units for different types of documents.
My default template is US Letter with units set to points. I also have a US Letter template with units set to inches, three generic custom page size templates with units set to pixels, a PowerPoint slide template with units set to inches, and a fourth custom page size template set to pixels for a specific project. Those are the templates that display on the File | New menu. (Well, Animation and Blank Photo do, too, but I rarely use them.)
I have another set of 10 templates for our web banner ads (pixels) that I access through either the Design Gallery or my file manager.
Having the units set in the template is vastly preferable in my workflow. I'd go nuts having to change them back and forth all the time.
Oh, something else that's very useful: you can have multiple documents open with each set to different units. Aside from making it possible to work on, say, a print flyer and an associated email image at the same time, it's a handy tool for checking meaurement conversions.
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