Moving from SPDs to Ultegra pedals

I've just upgraded my road bike from SPDs and mountain bike shoes to Shimano Ultegra pedals and Northwave Revenge shoes. Two reasons:
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1. I have had a bit of knee pain and wanted to see if a larger pedal platform would improve this
2. I wanted my road bike to have proper roadie pedals

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And I've also noticed a much better "fit" and ventilation from the new shoes as Luke suggest.
It takes time and you needn't really bother consciously trying to do it; it just seems to happen with good road pedals and shoes, like you have.
Now, when I ride a bike with spd's or, even worse, just plain flat pedals, it seems so much more like inefficient hard work.
Fast and Bulbous
Peregrinations
Eddingtons: 80 (Metric); 60 (Imperial)