I also got a fancy multi-colored assortment in durable plastic for color-coded storage of files that will be frequently handled. The vanilla manila ones are good enough (and cheap enough) for all the other stuff that just needs to be collected in one folder filed and then forgotten until needed.
I immediately go through box putting them in order: left tab middle tab right tab. Tehn it is easy to grab a set and get busy with setting up my file folders.