Thought I'd share this here for any modders who might find them useful.
I use Notepad++ for text editing. Setting up a UDL for the DEF files makes them much easier to look at. And you can ALT+0 to collapse everything for much easier navigation. Better than seeing smoke from your mouse wheel after scrolling like a mad man.
Items and weapon DEF scripts collapse to their ID so you can easily see ID's and make sure you don't have duplicates or check they're in order if needed.
I've attached them here to import into Notepad++ if you want.