In terms of organising, and getting more tools in the drawers etc. I have mine setup so that I basically I have 2 or 3 drawers with the key tools all laid out nice and tidy, combination spanner set, socket set and pliers/grips etc. Having these laid out means I can get the right tool quickly without sifting through loads of other stuff, and these are the tools I'm using 90% of the time anyway.
I then have other drawers which are for the less common tools, and I tend to pile a lot more in there, I don't mind a bit of a search for the brake flaring tool when I only use it once or twice a year.
I did however spoil myself a few months back and bought another big toolchest / cabinet thing, during one of machine marts vat free days, this is currently sat in the conservatory, virtually empty, waiting for me to clear space for it in the garage. I can then get more of the tools organised, and of course buy more tools !
One tip I would say, don't get one of those roll cabinets with the large open area in the bottom, it's a waste of space, drawers are much more usefull.