Boy, does this question bring back happy memories! DH and I spent our honeymoon at the MK back in 1977, when there were no lines for characters, etc. and the MK was IT! Anyway, I have great memories and video of the 7 dwarfs following my DH (who was clueless!) all in a row. It is priceless, especially when DH stopped, (the dwarfs stopped), turned around (the dwarfs turned around). Then they all swarmed DH; really funny.
Anyway, about 5 years ago, we saw the dwarfs all at the beginning of Main Street in the MK. But since then, the only time I've ever seen them together was 2 years ago in Epcot, near Germany I think.
Going in January 06 and the dwarfs are on my list of characters we have to visit with....