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Opening it up once in a while is a good idea - as long as you don't do it so often you kill your FE or do damage to the engine.
For me, coming home from my parents, there's a very hilly stretch where I can climb to heat the engine up AND rev it out a bit on the hills. Of course, I can let it DFCO down the other side of the hill so my FE doesn't suffer a bit! (Mileage is usually exactly the same if I go this way or the flat way ... plus the flat way is more miles).
The other thing is the engine will "wear" in and be more used to the lower RPM. Then if you end up selling it to someone who drives it much more spirited, they're going to notice that it may be carboned up and the "wearing in" causes it to burn oil , etc if revved out.
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