Well I am going to defend DPP. I like it and use it with all my pictures - personal and work. It is easy to use and I have no issues with lag or any other negatives as described above. I only shoot in RAW and I like and appreciate what DPP offers me. Plus it does not take up much space, so you might as well download it and give it a whirl.
+1, and I like the fact that camera settings are stored to the images the same way as they're handled in camera, lens corrections etc etc. No nasty sidecar files or cumbersome databases needed because the edits are stored to the files themselves. I really prefer DPP for raw processing of my images (I prefer to shoot in a 'neutral' style). I do however use ACDSEE pro to browse and select my raws before editing (it's faster).
I'm forced to use Lightroom for my Sony RAWS, because it's the best option available (Sony's raw processor is slow, slow, slow) but to me Lightroom is counterintuitive, and I manage to get the results from it that I like, but in truth I don't really like it at all and continue to use DPP for my Canon photo's.