The ease in getting them out and back in makes it worth it to me - and I used foam core which takes up even more room. Fortunately, I have enough space. In your case, you would need adjustable shelves so you could have some narrow vertical spaces, because it looks like you have a lot of FQs. My shelves are adjustable, so I have some narrow spaces for my FQs. I'd show pictures, but I'm in AZ, and I'm talking about my CT sewing room. The AZ one is a book shelf in a closet LOL.
I bought foam core at the $ store - 2/$ and cut 4 from each sheet. The sheets are 20 X 30, so I cut them 7 1/2 X 20 - used the rotary cutter I use for paper.