Hi @mousey
I have much the same philosophy as @BobZ . Never bothered with the pretty pictures of 3D. Never downloaded the 3D libraries.
I’m really only interested in designing schematics and PCBs.
I have abused the Schematic editor on a number of occasions, however. eg. I drew a wiring diagram for my tractor. I also drew a water diagram for our little farm (tanks, water bore, pumps, pipe layout through the paddocks, outlets, etc.) 
Gigs are small beer these days unless you’re a band trying to break through. These days data storage is incredibly cheap compared to other running costs. I recently installed 20 TB of HDD storage because the old ones were coming up to 60,000 hours running time.
Holy smokes. Do you have a rack of HDDs? Are you using a laptop or a desktop PC? I feel that laptops probably give the best value these days unless you need all out performance. One big advantage is built-in battery backup. Of course I can also take it with me on a plane (unless the batteries go exothermic. 
) I use the laptop monitor and a 2K external monitor.
This laptop has a 1 TB SSD and its speed spoils me for rotating disks. I do not have to wait long to boot up. My wife’s laptop is older and under-used. It has a 2 TB HDD and it is very slow. Even when you give it nothing to do, it always seems very busy.
Nah, 1x12 TB SATA, and 2x10 TB SATA in RAID-1. Enterprise grade too, so faster than the previous lot. Those sizes were the top about 5 years ago.
Mmm, better take this (but not my discs) offline. 
I’m pushing 100TBs of data storage here. I have 7 spinning rust drives plus a m.2 ssd drive, for the OS itself. Linux and LVM user here. Oh, got another 16Tb drive on the way. One LVM is pushing 90%.
I also have other drive setups for backing up all that data. o_O