we have a crib and use it a lot. of course, we have a very independent-minded 4 month old, so i'm not sure if it would get any use otherwise. anyway, it's in the other room (we have a small apartment, it's in the office/nursery) and we use it for naps and sometimes while we eat dinner/do chores, it's a safe, comfy space for her to be while we're busy. i expect she'll use it less as she can sit up independently and can join us in a highchair.
the other thing we use it for is quite unexpected... i started putting her in there to start the night before i went to bed, since i like to work in the bedroom, and much to our suprise, she slept much longer and more soundly in there than in our bed. i like having the extra space, at least to start the night, so we will definitely continue to use it for that.
in conclusion, i love our crib and use it much more than i thought we ever would, but if i had a baby who never wanted to be put down/ wouldn't sleep on her own, it would never ever get used.