Guilty as charged! Honestly I really think a lot of maths is just plain old boring repetitive stuff and I do feel most traditional maths curriculums could be compacted. Best thing school did was let her do a three year grade skip in maths and accepted there would be some gaps, but thought as the work would be more challenging - dd might be more interested. She has completed two grades since then and whilst she isnt exactly brimming with the joy of maths, at least she doesnt hate it either.
Makes sense, I guessed you'd mean something like that. I think you're right that many children could go through a school curriculum much faster, although many doesn't mean all so it would take some organising. TBH even for my DS, who definitely does have the joy of maths in his bones, it isn't the school syllabus maths that has him really excited, it's stuff he meets outside the syllabus. If your DD is up for some way out stuff, maybe you might show her the Dimensions videos, if you haven't already?
http://www.dimensions-math.org/