I suppose it's just the thought of having kit and duplicated kit which I don't use often.
Canon 20D, 5D - 12-24mm, 20-35mm, 70-300mm, 20mm f1.8, 50mm f1.4, 50mm f2.5, 85mm f1.4, 150mm f2.8.
GF1, G1 - 14-42mm, 20mm f1.7, 25mm f0.95.
The good things about the DSLR kit are (all but one of) the lenses which have markings and are easy to use manually and the top notch IQ. The things that I like least are the size, weight and attention grabbing nature.
The things I like about MFT are the compact, light and more discrete packaging. I dislike the difficult to use manually Panny lenses, the slight lag between the real world and the display and the night vision destroying display/EVF although that last one is only rarely a problem but when it is it's a very annoying one. My biggest gripe is the Panny lenses but I've come to accept that my wants will never be met by Panny and that's the factor which makes me wonder if I should give up with Panny.