I very rarely use photoshop, but lightroom or bridge or aperture is a truly essential thing to have your workflow based around tbh, if you take even a medium number of photos.
Just the ability to flick through the raws of a day's shooting, rate the producable shots, bin the absolute dud raws to save disk space (test shots etc) is essnential imo... going through and copying and pasting files in windows, or worse, opening each one in ACR, would just be unimaginably painful. Even if you don't have lightroom or aperture, download bridge (free

), it just saves SO much work when it comes to reducing down shot numbers.
As for lightroom, I'd really suffer without it now! As far as an organisational tool, as I said, rating system, quick searches by camera, date, even lens, and keyword tag are all really essential to not losing track of where photos are.
I _very_ rarely have to dig into using photoshop, only when I want to use filters, or do some more heavy duty stuff - lightroom is able to handle over 95% of what I want to do, and paint.net (a free and light weight image editor that still has decent functionality) handles the few little things that lightroom can't do but I can't be bothered to use ps to do.
Also, the batch processes, saved procedures and presets in lightroom is an absolute godsend if you work with a lot of images... just saves time doing the little things (eg exporting small versions, keywording, etc), and even a built in system for very simply making a simpleviewer gallery of pictures, and automatically ftping them to my hosting, is just fantastic.
Cobra, for lots of the other tools, go into the 'develop' stage of the workflow

At the end of the day, it's not photoshop, but imo you don't really want that for when dealing with lots of images, you want to be able to tweak something quickly, maybe check again what it looked like without the changes, etc... the ACR style controls in the screenshot above of exposure tint etc, a simple straighten and crop tool (and lightroom's straighten tool is the best out of ANY software I've ever used...), heal and clone, decent functionality for good greyscale conversion, are probably all most people need for /most/ images really...