A few extra thoughts on my obsession with InDesign’s Fit Selection in Window:
1. I think some of my joy stems from the fact that I am left handed and thus mouse with my left hand and do keyboard shortcuts with my right hand. So I feel very balanced using stuff on the right side of the keyboard. Righties, your mileage may vary. Still, it won’t be as awkward as the many times I visited a right handed co-worker’s desk and had to cross my arms to drive their Macs out of some digital ditch.
2. Daring Doers of Desktop Demos may also have a conflict, since they often employ command-option-= to trigger the Mac’s Universal Access System Pref screen zoom.
This is an awesome feature when you’re putting on a show and need be sure your audience can see exactly what your cursor is up to. I’ve also used it to magnify markup on scanned PDFs that was otherwise illegible (my eyes are old and bent). But if you’re not in front of an audience you’ll probably benefit by turning it off and using those keys for InDesign.
3. Laptop users, where’s the love? If you have a model with no option key on the right side, you have no choice but to go to Edit > Keyboard Shortcuts and assign something else. Maybe just change it to command-shift-= True, that’s assigned to Superscript by default, but I think Fit Selection easily trumps Superscript. And command-shift-0 is unassigned, so there’s your Fit Spread in Window.