Ha, I always thought your pics were just in the condition you bought your set in. What other restrictions do you give yourself during set builds, beer goggles? Hand cuffs?
Lol.
Actually the ones I've bought used I've done by the bag to make sure I have all the parts. It's only the new sealed ones I do like this.
My only other handicap is having a 6 week old baby!
As I said before I mix it up just to stretch out the build a bit longer. I power through otherwise and I'm always annoyed then it's all done as it's all gone!
As it happens, I also love the rustle of LEGO and I like trying to find one part among a few thousand! Probably 85% of the time I have little issue finding the parts I need. Just get used to scanning the whole pile for all the parts in that step the same as you do if you just have the one collection of bags. Though I think a lot of you might empty them all and then pile the different parts up. Heathens.
Only time it's a bit annoying is when the instructions don't particularly clearly show the difference between a grey or a silver part, commonly it's 2x1 plate grills that I'm like "is that grey or silver?".
I know it's not for most people, but this is how I played with LEGO as a kid. Empty the big red buckets on the floor and go! Rustle rustle, build build, rustle rustle, build build, sleep, scream as you step on some in the night. Lol
