Most useful thing was our glider, our rocker/recliner, our oversized big chair, and our king size bed!! These are things that are on the high end of the gift spectrum I know. But we spent many a day and nights in these things!!
We had the glider, rocker/recliner, and king size...but when preg with my girls my mom got an empty coffe can and wrote on it Twin A and Twin B fund. Whenever someone came over to her house they deposited funds into the can. My mom gave me the can when they were born and said spend it on whatever you need.
When the girls were 6 days old we went out and bought the rocker/recliner. It was really for dh because he spent alot of time falling asleep in our other non reclining chairs with our ds and wanted to be able to recline if he was going to do this again times 2. So it was officially "dad's chair". But mommy used it LOTS!! I was literally stuck in it all day and all night nursing my girls and it was so nice to be able to kick my feet up and recline. We purposely got a recliner with the material in the middle btwn seat and foot part so the girls wouldn't slip through. Or I could lay one there while I got situated. It was a godsend!! Those first few months of literally nursing one or both babies ALL DAY are the roughest. Having a good comfy supportive safe enjoyable nursing spot makes all the difference!!