I have an old computer desk that I put my sewing machine on. It sits a little lower than my current computer table. It's seems to be the right height for me. (I'm on the short size.)
I have been using our ping pong table for cutting fabric. My cutting mat is too big for most of the other desks or tables we have. And it's a great place for laying out blocks. (Don't have a design wall. Sounds like a nice thing to have tho!) I also lay out the top, batting and back for basting on it. It doesn't quite hold the whole quilt flat on top but for me I prefer it to the floor. My knees can't take that activity for long.
Unfortunately, it means my children don't get to play much ping pong

but they seem to be surviving.