i spent some quality time with my car this weekend too cleaning her out, the more space you have in a car the more you have to fill, and having a wagon now.. lol
My way of cleaning the engine bay is a little less detailed than yours, empty a can of degreaser into the bay, go back to bed, come back in a few hours after its sat.. rinse repeat a few times [my engine bay was filthy, guy who owned it blew the turbo not long before i got it, oil EVERYWHERE]
You might not have got to do it all yet but on long jobs every bit counts and you'll appreciate what you've done when it comes time to do the next bit! :)
I left the degreaser on for a whole 5 minutes then started killing my back by scrubbing with a toothbrush and acetone in some places... I recently bust my back and have been in recovery so this definitely didn't help me, urgh! Maybe I should do your spray on go to bed and come back method!