I actually use Dyn.Vol for everything but music. I'm pretty much always at the "Evening" setting, even with HD-DVD / Blu-Ray movies, as I find I can watch an entire movie without ever touching the volume at all and my wife doesn't make a peep to complain
Of course I live in a townhouse, without a dedicated HT space, or else I would probably want to feel manly and not chop off any dynamic range.... but honestly I never feel like I'm "missing out" on the dynamics of movies anymore, and I never have to scramble for the remote when the explosions start. Pretty cool.
I have my Harmony programmed so that the 1/2/3 buttons on the number pad correspond to Day/Eve/Mdnt in most of my "activities", so it's easy to flick the switch if necessary. If the wife isn't around and I'm not worried about rumbling the neighbors I'll switch over to "Day" setting. If the wife is asleep I'll switch to "Midnight".
I've compared Dynamic Volume "Day" vs. just using Dynamic EQ (no Dyn.Vol) and the difference is so slight that I basically just leave Dyn.Vol on all the time and use the "Day" setting when I want to let 'er rip.
@ ASB-123 -- I suggest you spend some time reading my FAQ and Setup Guide, as well as some common resources like the Audyssey FAQ and the Setup Guide. Also, just spend some time browsing this thread. Read the first 30-50 pages, read the last 30-50 pages (no need to read all 300!
) you will learn a whole lot.