I like aperture-preferred metering and shooting. I always have (and in my case "always have" means a really long time!) All lenses have an optimum aperture for sharpness and I test for that with each lens that I acquire. I got myself a Leica D-Lux 4 in December, 2008 and immediately took to using the live histogram as a primary metering tool. I would set the camera in A mode @ f/4 and apply exposure compensation to get the histogram looking correct. I believe the results I got from that now-sold camera were superior due to the attention I paid to the histogram and exposure compensation.
Now I have an E-PL3. When I turn on the histogram and then try to apply exposure compensation, the histogram goes off!!! So, to effectively use histogram-based metering, I have to jump back and forth between A and exposure-compensation modes. It's almost as bad as doing histogram test shots with my E-5. Argh.
The other day I stumbled upon a new technique which makes histogram-based exposure metering a joy on my E-PL3. I had unknowingly slipped my E-PL3 into M metering mode while the histogram was activated. When I started spinning the rear dial, the shutter speed started moving back and forth AND the histogram was moving along with it. Then it dawned on me: By using A mode with exposure compensation most of the time in the past, I was essentially in M mode; I wasn't letting the camera do it's full metering thing anyway! So, now I choose my aperture in M mode. I use the rear wheel to adjust the shutter speed while I watch the histogram. This works quickly and really well!
If you were wondering, I use my own variation of ETTR (expose to the right) metering when the histogram is employed. Basically, I've determined just how far to the right I can generally go and still recover highlights. That does tend to give me an over-exposed image which draws down quite nicely
in Lightroom when I reduce exposure. When all is said and done, I don't lose the highlights and the shadows I get from my m4/3 Olympus sensor are really very good. The results are certainly superior to letting the Olympus jpeg engine and metering system do their things independently of my brain.