I prefer to do all of one step at a time. So first I gather and prepare my fabrics. Then I cut my fabrics into the strips, I sew the strips together, I make whatever set of sub-units, and so forth. I much prefer to do assembly line to block by block. Yes, it can cause problems if I make a mistake -- but it's a consistent problem so therefore easy to remedy if time consuming.
It is a lot of what I call "front loading" and yes, often boring since I usually make queen sized projects but then when all the tiny little pieces are made and you start putting things together it becomes a joyous thing.
I'm currently working on a project that I can't really go assembly line. I'm at the block by block stage and it would be easier in many ways for me to work in my normal way, but this is a planned scrap layout and it gets too confusing to work on more than 4 or so blocks at a time and ultimately single block is the way to go -- but it's not the way I want.