My organization is pretty simple, although the list is long
Its easy for me to find something when I want it.I keep a med size plastic box in the kitchen with the things I sometimes currently use: my plastic bag with all my coil rebuilding stuff, a small divider box with some drip tips and any other small things I might want to use, RBA and/or tank I may not be using at the moment but might want to use (I usually use one for a few weeks and then switch to a different for a few weeks), extra mod I might not be using at the moment but could want at any time. About every 6 months I clean it out and adjust. My rule is: if it doesn't fit in that box OR isn't one of the 3 mods and tanks/RDA's on the shelf it doesn't need to be in the kitchen.
I keep the juices I'm using in a tray box (limited to no more then 12 bottles at a time), 3 mods and a tank and RBA along with my charger on the kitchen counter. All things I use very often.
My flavorings, other juice bottles beyond those in the kitchen, along with larger bottles of my favorite juices (I mix my 3 favorite juices in batches of 200mls and then refill my 30 mls as needed) are all kept in the basement where its cool and dark. My flavorings are divided in different boxes by: fruits/tobacco and drinks/bakery and misc./flavors for 5 most often made juices and currently using nic bottle/and an overflow box for flavorings I have multiples of same flavoring. Tried the alphabetical thing once. That was a disaster
Upstairs is where I keep my stash
Some in my bedroom under the bed and the rest in the spare bedroom closet. I have separate clear plastic shoe boxes for: Subox tank stuff, PT2 stuff, cartos, coil building supplies, Aromamizer stuff, Melo III stuff, 808 Vgos and cartos, Vivi nova's, DIY supplies, extra batteries-battery wraps-extra chargers, extra bottles, broken-used-odd but maybe needed some day box. Larger plastic box for 510 attys-misc rda's bought in co-ops yrs ago-stash RDA's-divider box with more drip tips and other small stuff. Another large plastic box with stashed mods/tanks. And finally a box with all my previously used MODs that I'm not currently using. I'm sure I've forgotten something, but that gives you guys an idea of how I've organized my stuff.
I've tried different ways but dividing by type has worked best for me. Adding the smaller box with just the bottle of nic and the flavors for my 5 most often made juices works really well when I'm in a hurry. 
