I particularly think perfeccionist designs are for elitists. My fortresses are a big mess usually, plenty of unused stockpiles or multiple stockpiles for the same stuff, Z-levels don't make sense at all, mixed workshop types and eventually workshops leading to workshops (because I always begin with a cross-design, when I need to expand I can't go diagonals so I build a corridor from that workshop leading to another) and I can enjoy the game fully.
There is NO design that can make the game unplayable. Even if you do make a perfect design, it is very likely your dwarves won't use it the way it was intended, plus, when you get dozens of dwarves it is impossible to micromanage them all. You'll just think about the fortress as a whole and they'll go and do stuff for you (dwarf therapist is mandatory if you wanna labor them correctly).
All in all, I recommend that if you're not good at designing layouts, just don't. Do whatever you feel like, and when you see it's not working, fix it as possible. If not possible, well, you can always just build walls or wall in that particular part and pretend it never did exist on the first place, or just build a random stockpile (it's never enough).
You'll get good at it eventually, trust me.