Standards!? What standards? Two guys here work in Inventor, two (me included) in Vanilla AutoCAD. I LIKE the way I can have an entire machine in one file. Each layer has any linetype or color I want and they rarely change. I usually have an assembly layer, several detail layers where I copy over the area to detail keeping LT and Color, clean up, dimension, drop in a border and Voila!
I've build a fair sized library over the years. It's easy to find a similar design in another file (I store by machine type), cut-copy-paste,modify it, dim it and Voila! Another drawing done and it ain't even lunch yet.
A couple of thousand entities in 8-10 layers (Each layer a drawing).
Then I get a file with 98,000 entities from the Inventor guys and my regen times...
Like 700 entities for the 8" gear I would do in maybe 20! Maybe you want electrical on a different layer than ductwork but I 'ain't got no' electrics or ducks in my mechanical dwgs. If I pushed, I could do a machine in a day (with pre-art) but it gets 'stretched' to about a week. The real drag is spec changes or design changes. I hate to get too far ahead before the design is frozen 'cause it's a waste of time like driving before you know where you are going.
I have to admit my LISP routines help a lot. Since V10 like our eastside of town it just happened that way and I was the only one on CAD. BTW 11/10 is my 20th year with the company.