Full compression of a bag is not a good practice, which is why many high end bags come with a loose storage sack, as well as a stuff sack, employed when the bag is actually out on a backpack. However, I must say that I stuffed down bags for quite a few years into a fairly compressed storage mode, and never noticed a big difference.
I use synthetic bags, and generally store them in not very large stuff bags (though not fully compressed). Like hikermor, I have not noticed any significant loss of loft. One does need to open them up a bit before bedtime to let them fluff up, before crawling in.
While it is no doubt better to store them loosely, I think the alleged loss of loft from storing sleeping bags compressed is rather exaggerated, at least with regards to modern synthetic materials.
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