Uhm, back on the original question... :-) I think you've said it well in your initial post. I would add (and you probably are also charting this in your work) these.
Fast pace in the Dresden Verse also follows a basic premise that the tension intensifies over the length of the book. There is an upping of the emotional ante in the plot.
On the Dresden Verse subplots, they fit. None of that, 'why do I have to read about this turkey or spend time on a flabby subplot'. Jim's subplots fit seamlessly, they are intelligent, and they are vital to the major plot.
Good luck with your writing.
FYI, I do not love excel character sheets etc. I hate them, but I do them. I also track every scene for its value (if a scene isn't adding three items to the overall plot, it gets cut or enriched), and I track every scene for its tension level, which I rate. I want to see that tension increasing. I will also balance and note on the sheet what type of tension I've put in there--action, threat level, character arguments, sexual tension etc.